These Vision Markers for RoboMaster S1 from DJI are designed to work in conjunction with the RoboMaster's vision tracking, programming, and targeting capabilities. The markers stand up on their own and are constructed from durable paper material that's protected by a waterproof matte film. You get a set of 14 markers, two each of the numbers 1 to 5, a question mark, and heart shape.
UPC: 190021335288