Professional gade, American made. Mayhew's cable tie product line delivers durability you can depend on. Constructed of solid-piece nylon, each cable ties features a flexible self-locking design that allows for quick usability and secure fastening for whatever you need to pack, organize, contain, or transport. Superior pawl design allows for easy insertion and pull through, while the tough serrated edges provide more precise locking. The grasps on each end allow for user to more securely grip and tighten cable tie. Available in a variety of sizes to accommodate your specified bundle diameter, tensile strength, and operating temperature needs. Each cable tie is made in the USA and meet UL Type 2 & 21. Type 2: Metallic, Nonmetallic and Composite Cable Ties retains 100% declared loop tensile strength after specified test conditions. Type 21: Nonmetallic and Composite Cable Ties - Type 2 with additional pre qualification to long term performance characteristics of nonmetallic molding materials in accordance with the UL component plastic materials certification program (QMFZ2).