These 1" wide collars are our strongest ever, providing protection and firm control over even the biggest dogs. Two layers of tough nylon are stitched together and bar-tacked at the corners so they never wear out. Collars have all-metal hardware to stand up to hard use. Each collar is fully adjustable for a comfortable fit. Matching Double Layer Nylon Leads are also available and sold separately, see item TP528. Double Layer Nylon Colors are available in the colors and sizes listed below.