This kind of bicycle bowl set, with fine quality material, high strength, nice hardness, is a practical bicycle accessories. Features: Fine workmanship, practical, flexible and smooth rotation. Aluminum alloy material, high strength, nice hardness, not easy to deform. Not easy to rust, long service life. Practical lubrication, smooth, fine user experience. Small and portable, easy to install. Specifications: Material: aluminum alloy Item weight: 126g / 4.4ounce Package size: 65 * 65 * 50mm / 2.6 * 2.6 * 2.0in Package weight: 138g / 4.9ounce Packing List: 1 * Bicycle Bearing Set