Rubber for Cargo Straps- These 1/4" thick strap guards stay in place even if cargo shifts. Permanently on strap so it wont' get lost. Steel for Chain and Cargo Straps- Great for sharp and rugged edges. Also used on crates to increase sturdiness. Plastic for Carton Straps and Cargo Straps- These carton straps prevent plastic strapping from "cutting" into cardboard cartons. The cargo strap guard is an economical way to protect cargo and strap damage. Edge Protectors Model Construction Size(WxL) Pieces PerPackage Weight(Per Pkg lbs) EDGE-R12 Rubber 5-3/4"x 12" 50 36 EDGE-R6 Rubber 5"x 6" 100 31 EDGE-S7 Steel 7-1/2" x 4-7/8" 10 15 EDGE-S6 Steel 6"x 4-3/8" 10 12 EDGE-P2 Plastic 2-1/2"x 2-1/4" 1,000 28 EDGE-P5 Plastic 5-3/16"x 4-1/4" 100 13 EDGE-N1 Nylon 5-3/8"x 3-7/8" 100 21 EDGE-N1-12PK Nylon 5-3/8"x 3-7/8" 12 3 EDGE-P1 Plastic 1"x 1" 1,000 9