M-Sling Endless Flat Slings for lifting, Type 5 Flat Eye Sling - Synthetic web lifting slings offer a number of advantages for rigging purposes: Strength, Convenience, Load protection, and Economy. Endless flat lifting slings are susceptible to cuts and abrasion damage, as well as damage from temperatures above 200°. These lifting devices should be protected from sharp edges, sharp projections and heat sources such as steam pipes, open flame and welding splatter.