Ring to Ring Slings are made of 12-Strand Polyester coated in All Gear's Husky Urethane� Coating and covered with Chafe Sleeve. 1/2" x 30" has a 3/4" Low Friction Ring and a 1-1/8" Low Friction Ring installed with a Locking Brummel Splices, 5/8" x 40" and the 3/4" x 50" have a 1-1/8" Low Friction Ring and a 1-1/2" Low Friction Ring installed with a Locking Brummel Splices .