The price listed is for twelve acrylic stones. These are approximately 15mm opaque green acrylic stones. These appear to be unfinished parts of a button. These have a 6mm recess on the back with two 3mm recess next to them
. These recesses can fit stones for decoration. These can also be used as beads, or spacers between beads. The rectangular hole on the stone measures about 5mm by 3mm.