Chewer: Heavy Size: 70mm long, 60mm wide, 13mm thick The puzzle piece sensory chew necklace is a lovely tool for calming and soothing oral sensory seekers who like a chunkier shape. The back side of the puzzle piece is also textured for added sensory stimulation. We have paired this piece with a breakaway clasp and strung it on a soft cord. The breakaway clasp improves safety by breaking open when large force is applied to it and the cord offers a soft non scratchy finish which will not irritate the wearers skin.