1. Material: steel, stainless steel 2. Net weight: 232 grams 3. Bearing capacity: 300 kg 4. Dimensions: length is 125 mm, width is 55 mm 5. Features: Durable nylon grooved wheels, mute bearings on both sides, no noise, flexible, 304 stainless steel rings with strong load bearing and wear resistance 6. Uses: fitness equipment accessories