This quality collar is made from heavy duty 4mm biothane with 1 inch standard biothane accent. The attached traffic lead can be made removable with a bolt snap or permenetly attached to the collar on a seperate ring. Our magnetic buckle keeper stows the traffic lead when not in use, but is easy to unhook when needed! The traffic lead can also be made adjustable, allowing for a little more length when in use. This unique collar design is great for those offleash trained dogs!