Guardian Gear Nylon Adjustable Collars Guardian Gear Quality Nylon Collars and Leads Last For Years High-quality nylon adjustable Collars feature quick-release, plastic delrin buckles that are contoured for comfort. Bar-tacked construction means these collars will last for years. High-quality single layer nylon Leads feature bolt style snap and bar-tacked construction for added durability. Measure 1" wide x 6' long. Small - 5/8" wide & adjustable 10"-16" Medium - 3/4" wide & adjustable 14"-20" Large - 1" wide & adjustable 18"-26"