Fifty pieces of kiln dam that can be used to contain (dam) arrangements of glass in the kiln. We use them to regularly contain a 13" diameter x .375" thick disk shaped project. They are also regularly used to prop up dropout rings and slumping molds. Pieces range in size from 1.25" x 1.25" to 1.5" x 1.635" and weigh 50g each, on average.