This Adjustable Friction Saver is made with Arbo Space 12.7mm Arbor Flex 5′ with Arbo Space Mars Prusik 30in. Notch Wear Safe Aluminum Rings: 33% larger bend radius for purpose-driven design 33% larger bend radius for purpose-driven design. Hot forged 7075 aluminum construction. Compatible with rope-style bridges. 30kN MBS Minimum Breaking Strength. Available in two sizes. Individually serialized for traceability. Small Size 28 x 54 mm. Minimum Breaking Strength MBS of 30kN for added safety. Inside Diameter of 28mm and Outside Diameter of 54mm for versatility. Lightweight design at 1.9oz 53g for ease of use. Made of durable aluminum material. Anodized finish for increased durability and corrosion resistance. Large Size 48 x 74 mm. Minimum Breaking Strength MBS of 30kN for added safety. Inside Diameter of 48mm and Outside Diameter of 72mm for versatility. Lightweight design at 2.8oz 79g for ease of use. Made of durable aluminum material. Anodized finish for increased durability and corrosion resistance.