Square 351 Style 2 Pack PickSlab The quality is the difference The 2 inch crystal clear capsules are designed to hold your 351 style guitar picks. Oxygen and UV light break down guitar picks/plastics. PickSlab capsules are made with high-quality PMMA acrylic. PMMA offers UV protection and is both durable and scratch resistant when compared to other commonly used materials, such as polystyrene. The dye-cut high density foam that houses the pick is designed to provide a safe and snug fit to frame your pick. This is a great way to store, protect and display your individual prized picks. Each holder consists of a base, a high density foam insert and a lid. The pick is inserted into the foam and then sealed shut between the lid and base. Once snugly closed, the capsule can be reopened only by using a small notch built into the lid that allows the capsule to be unsealed with a small wedge or tool. Ideal for your Nylon, Derlin\Tortex cellulose (modern celluloid) etc. picks. These are not recommended for long-term storage of your vintage, true celluloid picks