Extra heavy duty ties for application where higher tensile strength is needed. Material Specification: Natural Nylon: Cable ties made from U.L. approved nylon 6/6. Normal service temperature range: -40oC to 85oC. Flambility rating: UL 94V-2. Black Nylon: (Material and temprature as above) Except in black color. For your order please add "B" to standard item no. i.e.CV-075B. Weather Resistant Nylon(ULTRA VIOLET): Carbonate "A" was added for greater resistance to ultra violet light in outdoor application. For your order, please add "W" to standard item no. i.e. CV-075W Heat Stablized Nyoln: Service temp. 135oC Specification: Made to comply with mil-spec drawing no. MS-3367 tensile strength meet or exceed MIL-S-23190E standard. Our company is the leading manufacture of cable ties and related wiring accessories in China, and we know that what we will do is to meet our clients' requirements. We'll give you the best service, lowest price, and the most important is best quality. Please feel free to contact us if you have any questions!