One-piece molded design made from special high-strength nylon composite materialSuper light and impact resistantIncludes the new Motion Pro aluminum LiteLoc rim lock nut and beveled washerRim lock for 1.40"/1.60" (3.6x4.1cm) wide rims weighs only 35 grams (1.2 oz.); rim lock for 1.85" (4.7cm) wide rims weighs only 57.17 grams or (2.016 oz.); rim lock for 2.15" (5.5cm) wide rims weighs only 68 grams (2.4 oz.)Unique contoured shape protects inner tube from abrasion and reduces heatUnique angled and tapered ribs lock tire securely to rimTested 10 to 20 percent stronger than cast aluminum rim locks and only half the weightPatented design