Dayan Cubes is a Chinese brand designed by Daqing Bao. DaYan is the pinyin of his name "大烟头" (Da Yan Tou).
The logo on Dayan cube uses the last character "头".
Dayan Zhanchi V5 3x3x3 57mm/55mm/50mm/42mm SPEED CUBE
Dayan Zhanchi 2x2x2 50mm/46mm SPEED CUBE
Old Plastic Dayan Zhanchi 2x2x2 46mm
Dayan Megaminx WITH Ridges TWISTY PUZZLE
Dayan Megaminx W/O Ridges TWISTY PUZZLE
DaYan Pyraminx PYRAMID CUBE
Parts: Core for DaYan Zhanchi 3x3
Parts: Center Cap for DaYan ZhanChi 3x3 WHITE