• Mobile Fidelity - Original Master Record Heavyweight Inner Sleeves (50pk) Vinyl Sleeves Mobile Fidelity Sound Lab - Arcline Store
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Mobile Fidelity Sound Lab

Mobile Fidelity - Original Master Record Heavyweight Inner Sleeves (50pk)

Mobile Fidelity - Original Master Record Heavyweight Inner Sleeves (50pk)

  • HeavyWeight edition with 120gsm thickness for extra-sturdy protection
  • Three-ply anti-static design with paper core between two HDPE layers
  • Translucent HDPE front for easy record identification
  • Helps prevent scuffs, contamination, and static build-up
  • Pack includes 50 inner sleeves
$29.95 USD
$29.95 USD
Liquid error (snippets/price line 128): divided by 0% OFF Sold out
Shipping calculated at checkout.
Dent-free worldwide delivery Dent-free delivery
Hassle-free returns Hassle-free returns
Audiophile-grade sound Audiophile-grade sound
No Bootlegs 100% official releases

Description

If you want the “do it once, do it right” inner sleeve for your collection, these are it. Mobile Fidelity’s HeavyWeight Original Master Sleeves upgrade the already-famous MoFi design with thicker 120gsm construction, giving your LPs a more rigid, premium feel and better long-term protection. The three-ply build combines a paper layer for structure with high-density polyethylene (HDPE) on both sides to reduce static and minimize surface contact that can cause hairline marks. The translucent front also makes it easy to keep your collection organized without pulling records out. For collectors protecting expensive pressings, audiophile reissues, and daily spinners alike, this 50-pack is one of the smartest upgrades you can make.

Shipping & Returns

Standard processing time is 1–3 business days. If you need your order urgently, please choose Express shipping and send us a message - we’ll prioritize your order.

Careful, Secure Packaging:
We ship all orders in protective, vinyl-specific mailers or sturdy boxes to ensure safe, dent-free delivery - over 99% of orders arrive in perfect condition. Some orders may be split into multiple parcels for extra protection at no additional cost

  • Economy Delivery (Free for $100+): USPS Media Mail fully tracked delivery, typically arrives within 5 - 10 business days. Orders over $100 ship free. Under $100? A flat fee applies at checkout.
  • Standard Shipping: USPS Ground Advantage or UPS Ground, fully tracked delivery, typically arrives within 3–5 business days. A flat fee applies at checkout.
  • Express Delivery: UPS 2nd Day Air fully tracked delivery. Your order will arrive in 2 business days anywhere in the USA. A flat fee applies at checkout.
  • International Standard: 7–21 business days. Fully tracked via USPS + local postal service. Import duties, VAT, or customs fees are not included in our prices or shipping costs. These are set by your country and are the customer’s responsibility.
  • International Express: DHL Express, fully tracked delivery, typically arrives within 3–5 business days depending on the destination country. Please check rates at checkout.

Please note: Media Mail is a budget service with limited tracking and no delivery guarantee. We cannot offer refunds or replacements for items lost or delayed with this method. For time-sensitive or high-value orders, please choose Standard or Express shipping.

For more details, see our Shipping policies page.

Preorders

If your order includes both in-stock and preorder/backorder items, everything ships together once all items are available, within the window listed under "Estimated Shipping Date." If you want your in-stock items sooner, please place a separate order for those.

For more details, see our Pre-order Policies page.

30-day Refund Guarantee.

Not satisfied with your purchase? You can return it within 30 days for a full refund, as long as it’s in its original condition. Contact us at support@arclineusa.com with your order number and reason for return to initiate the process. We’ll provide you with a return shipping label and instructions on how to send the item back. Once we receive the returned product, you’ll get your refund.

For more details, see our Returns and Refund policies page.

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Frequently asked questions

FAQ

Can accessories improve sound quality?

Indirectly, yes. While sleeves won’t change the sound, cleaning tools and anti-static solutions reduce pops, crackles, and wear on your stylus, giving you clearer playback and longer equipment life.

Why should I use record sleeves and accessories?

Vinyl records are delicate. Dust, fingerprints, and sunlight can cause permanent damage, leading to pops, clicks, and sound degradation. Accessories like inner and outer sleeves, cleaning kits, and storage solutions protect your records so they last a lifetime. Think of them as insurance for your collection.

Do I really need outer sleeves for my records?

Yes. Outer sleeves protect record jackets from shelf wear, ring wear, scratches, and dust. They keep artwork in pristine condition and are especially important for collectors who want to preserve limited editions or resale value.

What about inner sleeves - why upgrade from the paper ones?

Most new records come with standard paper sleeves, which can scratch vinyl over time. Archival-grade inner sleeves are anti-static and polyethylene-lined, reducing static build-up and protecting the grooves during storage and playback.

How should I clean my vinyl records?

Always handle records by the edges or label, never the grooves. Use a carbon fiber brush before each play to remove surface dust. For deeper cleaning, use a record cleaning solution or machine with microfiber cloths - never household cleaners, which can damage vinyl.

What’s the best way to store vinyl records?

Store records vertically, like books, not stacked flat - stacking can warp them. Keep them in a cool, dry place away from direct sunlight and extreme heat or humidity. Proper shelving with support dividers helps prevent leaning and warping.

How often should I replace record sleeves?

If sleeves are torn, dusty, or causing static, it’s time to replace them. Collectors often replace factory sleeves immediately with archival ones for long-term storage.