Description: With exquisite workmanship, the brake caliper piston ensures better sealing performance. The deep concave design on the back can provide center thrust. With fan-shaped radiator design, the brake caliper piston can reduce the heat transfer contact area, increase the air shuttle, which will help to heat dissipation. It can resist heat 400 degrees Celsius, and won't broken or crack. Made of high quality ABS material, the product is sturdy, wear-resistant and durable. The length of the big piston is 1.8cm, tyhe width is 1.8cm, and the height is 1cm. The length of the small piston is 1.6cm, the width is 1.6cm, and the height is 1cm. It's suitable for Shimano ZEE M640 M810 M820 M7120 M8020 M8120 M9120 brakes. Item Name: Brake Caliper Piston Kit Material:ABS Compatible Models: for Shimano ZEE M640 M810 M820 M7120 M8020 M8120 M9120 Color: Black Size Details: Big Piston: 1.8cm x 1.8cm x 1cm/0.71" x 0.71" x 0.39" (Approx.) Small Piston: 1.6cm x 1.6cm x 1cm/0.63" x 0.63" x 0.39" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 X Big Piston 1 X Small Piston