Mylar in its most basic form is a clear material made of polyester resins. You do not need to be a science major to know Mylar is strong and will stand the test of time. Mylar straps are perfect for safely securing your badges and are available with two-hole smooth clips, knurled thumb grips, and U-bulldog clips (all 100 packets). Consider your need and select the most applicable option. Also consider the Fellowes Pouch ID with Mylar strap (100 packets) or the equally efficient GBC ID Badge clip with Mylar strap in a 10-count pack.