Choosing the right coin capsule size
Every coin capsule is sized to a coin's diameter in millimetres, so the first step is knowing how wide your coin is. Direct fit capsules are moulded to one exact size, the coin sits straight into the recess and is held snugly with no movement. Black ring capsules use a foam ring to frame a coin that is smaller than the outer capsule, which lets a single capsule size suit a range of coins and gives a neat display border.
If you are not sure of your coin's diameter, our capsule finder matches your coin by name or by measurement and sends you straight to the holder that fits. For popular British and world bullion coins, our size guide lists the exact diameter and the matching capsule for each one.
Coin capsules vs coin tubes and flips
A coin capsule seals a single coin in a hard, clear shell for display and long-term protection. A storage tube is different, it holds a stack of up to 20 matching capsules together, which is ideal once you are collecting a set or storing bullion in quantity. Many collectors use both: a capsule for each coin, then a tube to keep the set organised and protected.
Coin flips (soft PVC or card sleeves) are a cheaper option, but they offer far less protection and, in the case of PVC flips, can actually harm coins over time. Our capsules are made from rigid, PVC-free acrylic, so there is nothing to react with the metal.
Why use coin capsules for long-term storage
Handling, dust, moisture and airborne chemicals are the main causes of avoidable damage to coins. A sealed capsule keeps fingerprints and grit off the surface and slows the air exposure that leads to toning and spotting. For bullion, that protection helps preserve the pristine condition that buyers and graders look for.
The key thing to check in any holder is that it is PVC-free. PVC releases plasticisers that can leave a haze or sticky residue on a coin, sometimes irreversibly. Every capsule we sell is PVC-free acrylic, made by Air-Tite, so it is safe for indefinite storage.
Frequently asked questions
- What size coin capsule do I need?
- Match the capsule's inside diameter to your coin's diameter in millimetres. Direct fit capsules are moulded to one exact size; black ring capsules frame a smaller coin inside a larger capsule. If you are unsure, our capsule finder matches your coin by name or by measurement.
- How do I measure a coin for a capsule?
- Measure the coin's diameter across the widest point in millimetres, ideally with digital callipers. Use that figure to pick a direct fit capsule of the same size, or a black ring capsule rated for that diameter. Our size guide lists the diameter of most popular British and world coins.
- What's the difference between a coin capsule and a coin tube or coin flip?
- A capsule protects one coin in a hard clear shell. A storage tube holds a stack of up to 20 matching capsules together, useful for sets and bullion in quantity. A coin flip is a soft sleeve that offers much less protection, and PVC flips can damage coins over time. All our capsules and tubes are PVC-free.
- Are coin capsules acid-free and safe for long-term storage?
- Yes. Every capsule we sell is made from PVC-free acrylic, so it does not release the plasticisers that can haze, mark or corrode a coin. That makes them safe for indefinite storage.
- Do coin capsules protect coins from tarnishing?
- A sealed capsule slows tarnishing by limiting the coin's contact with air, moisture and airborne chemicals. It will not stop toning entirely, no holder does, but it significantly reduces handling damage and the air exposure that causes spotting and haze.
- Can I use coin capsules for both bullion and collectible coins?
- Yes. The same PVC-free acrylic capsules suit bullion coins such as Britannias, Sovereigns and Krugerrands as well as collectible and commemorative coins. Choose direct fit for a snug single-size hold, or black ring to frame a smaller coin.
- What is the difference between direct fit and black ring capsules?
- A direct fit capsule is moulded to one exact coin diameter, so the coin drops straight into the recess and is held with no insert. A black ring capsule uses a foam ring to frame a coin smaller than the capsule, so one capsule size can suit several coins and gives a display border.
- Are Air-Tite coin capsules reusable?
- Yes. Air-Tite acrylic capsules open and close so you can insert or remove a coin without damage, and reuse the capsule for another coin of the same size.
- Do you ship coin capsules in the UK?
- Yes. Coin Storage is a UK supplier and ships every order within the United Kingdom by Royal Mail Tracked 48, at a flat rate of £3.99 per order.