Material: These bike brake pads are made of high-quality resin semi‑metal, more heat-resistant comparing with the general semi-metallic pads. They are also asbestos-free. Dimentions: These disc brake pads are 0.9 inch (or 22 mm) in diameter. They are 0.16 inch (or 4 mm) thick. 8 PCS (4 pairs) in a package. High Performance: These brake pads are better suited for low to medium temperatures (daily riding, light off-roading, etc.). They make the brakes sensitive and quick with strong braking power. No Damage to Brake Disc: The hardness of these disc pads is moderate, dealing no damage to the disc. The ceramic fiber component effectively suppresses noise. Suitable for Multiple Models: Can be installed and used when the shape and size match, bikes or scooters alike.