Thickness: 1mm. APPLICATIONThis heatsink is a special tool for RPI as well as perfect for cooling chips ram module CPU GPU and other small electronics that didn't come with any cooling. NOTEThis heatsink come without any thermal tape or adhesive tape we recommend using something sticky (here is not included) for your application. FEATURECoppery square tiny chipset with great cooling heat easy to install. KINDLY REMINDPlease wash your hands and clean the pads well (with alcohol and a microfiber cloth) before installing will be better for your successfully project.