Super Claw Spiked Collar 3ml Neoprene Liner on back of collar to provide comfortable fit Each collar is handcrafted with utmost attention to detail Constucted from high strength industrial polypropalene, each layer is 1100 lbs per sqaure inch test strength collars are 4 layers overall ad 7 in some Industrial grade steel accessories (D-Rings and Buckle) Velcro attachments on buckle strap to prevent collar from coming loose