A CubeSat (U-class spacecraft) is a type of miniaturized satellite for space research that is made up of multiple cubic modules of 10 cm × 10 cm × 10 cm size. CubeSats have a mass of no more than 1.33 kilograms (2.9 lb) per unit, and often use commercial off-the-shelf (COTS) components for their electronics and structure. CubeSats are put into orbit by deployers on the International Space Station, or launched as secondary payloads on a launch vehicle. As of 1 January 2021, more than 1350 CubeSats have been launched. More than 1200 have been successfully deployed in orbit and more than 90 have been destroyed in launch failures.