Each 3/4 in. Cinder Block is created from fine, hand cast cement. The block hangs from a 20" Stainless Steel chain with a clasp. The tiny cinder blocks are fragile, and may break if dropped or smashed against an immovable object, so handle with care! For an unbreakable option, the Cinder Block Necklace is also available in sandblasted stainless steel.