• The package includes 4 pairs of bicycle disc brake pads, 1 disc brake spacer regulator, 1 hydraulic brake piston press tool, and 1 hex key; all these components facilitate a smooth and easy installation process. • Quality material: made of durable resin semi-metallic material, they are safe, resistant to deformation and fading, reduce initial bite time, shorten the break-in period, and minimize noise for smooth on-road performance. • Versatile compatibility: compatible with Sram Avid Elixir E1 E3 E5 E7 E9 ER XO XX DB1 DB3 DB5 brake pads and Nutt hydraulic disc brakes. • Safe performance: provide reliable braking power in various riding conditions, enhancing the safety of bike rides. • Practical and aesthetic design: effective and attractive, with a classic color scheme and quality braking effect, they are durable and easy to use.