Made of tough, pliable, lightweight Lexan with "tight-snap" fasteners. The neck opening, which comes in eight snap-adjustable sizes, is padded with soft vinyl foam. Specially designed for the birds Helps overcome feather picking and the itch-bite-scratch cycle Combines long-lived toughness, softness and light weight Size: 6" Dia., Neck Dia.: 0.6"-0.9", Neck Circ.: 2.0"-2.7" Weight: 9 gram