Really Heavy Duty: Strength tensile is decided by Width and Thickness . Our ties not only widest, but also thickest(0.063inch/1.6mm), while most of 12 inch is just 0.051inch/1.3mm in the market. Same size ,but stronger for more projects | High Quality Material: We use strong and flexible material, weather resistant and outdoor in direct sunlight application is not an issue. withstanding temperatures from 5℉to 140℉, The UL Flammability is 94V.2 | Re-sealable Bag: There is one zipper on top of bag that makes storage and use much easier. Proper size bag won’t make zip ties bend | Details: 50 pcs white / 50 pcs black, L: 12inch, W: 7.6mm/0.3inch, H: 1.6mm/0.063inch, Nylon Material type: PA66 , UL listed | You Deserve a Guarantee: We offer a lifetime guarantee on our high quality ties ,your satisfaction is guaranteed