Lighthouse 100 Cardboard 2x2 Self-Adhesive Holders 17.5mm Coins Fits coins up to 17.5mm diameter. Lighthouse holders are free of chemical softeners for optimal protection. Press both sides of the holder together and the adhesive is activated. They also have a small tab for easy insertion into pages or books. Each order is for a box of 100 coin holders. Coins are NOT included.