Coin Slot Bank Galvanized Metal Lid Inserts for Mason, Ball, Canning Jars (10 Pack, Regular Mouth) 10 Pack! Fits *Regular Mouth* (2 3/8" internal diameter) Jars. Turn the glass jars you already have into piggy banks! Bands and jars sold separately - check out our copper, gold, and stainless steel bands, or use the rings that came with your jars. Keep one in the laundry room or your nightstand to collect loose change! Keep one in your closet to collect all those extra buttons that come with your clothes! They are made of galvanized steel. This means the cutout edges are raw steel, which can rust. Hand wash and dry.