[PARAMETER] Size 1: 14 x 14 x 6 mm / 0.55 x 0.55 x 0.24 inch (L*W*H); Color：Silver Tone. [FEATURE] This heatsink come with ordinary self adhesive(without function of conductive), easy to use, strong stickiness. [APPLICATION] The heatsink is a special tool for RPI, as well as for cooling chips, stepper motor driver module and other small electronics that didn't come with any cooling. [MATERIAL] Aluminum alloy, great function for heat transfer. [PACKAGE CONTENT] Total 4 Pieces(1 Set)-1 x Size 1 Heatsink; 1 x Size 2 Heatsink; 1 x Size 3 Heatsink; 1 x Size 4 Heatsink.