100% Nylon Imported The product is single picatinny rail. Allow the attachment of various 1913 Picatinny rail-mounted accessories. Pecawen picatinny rail can position just enough rail area exactly where you need it for each accessory. Pack Of 5 5 7 7 9 9 11 11 slots picatinny rail , 16 sets matched screws, 16sets locking T-Nuts and 2 allen wrench. Ultralight rail with solid polymer construction and low profile design reduces bulk. 11-Slot 0.56Oz, 9-Slot 0.48Oz, 7-Slot 0.36Oz, 5-Slot 0.28Oz, much lighter than aluminum alloy, high strength and good safety.