Made by Revolution Yo-Yos--a division of Team Losi; a company that makes radio controlled cars. The butterfly version of Da Bomb made by the same company. Includes one set of perimeter and center weight rings and a wooden axle to use instead of the ABEC 3 bearing that already comes with the yo. Nice graphics on the side of the disc covering. The weight rings look like they could also fit the imperial versions of their yo. Yo-yo was designed using CAD.