Dayan is a Chinese company founded by Daqing Bao (大烟头) that designs and produces cubes specific to speedcubing.
Dayan offers many variations of the Rubik's Cube. The list of the Rubik's Cube variations they sell follow below (from newest to oldest):
The Dayan Zhanchi is probably the most commonly used cube used as a speed cube, as Feliks Zemdegs used this cube to get one of his previous world records. Dayan sells most of their cubes in black, white, green, blue, orange, yellow, red, and stickerless.