These magnets are made from zinc alloy, plated with a matte silver finish, and then are filled with soft enamel. Both versions, BIKINI TOP and BIKINI BOTTOM measure about 2 38" high by 2" wide. They both have a 716" diameter button magnet. Both the tops and bottoms come in assorted colors. BTBOM15 - BIKINI TOP BOTTLE OPENER MAGNET12 - 47 Pieces = $2.00 each48 - 287 Pieces = $1.40 each288+ Pieces = $1.25 each TBOM15 - THONG BOTTLE OPENER MAGNET12 - 47 Pieces = $2.00 each48 - 287 Pieces = $1.40 each288+ Pieces = $1.25 each