Corks For Cylinder & Coins Pre-cut corks (4 pair) for the John Ramsay Cylinder and coins. Corks are not thin slices they are real cork, 22mm x 4mm thick. Works with both dollar stacks and 1/2 dollar stacks.Custom cut sets upon request at no extra charge. We import the finest cork we could find from Portugal, no dried out cork that crumbles.