R2FG is a professional yo-yo manufacturer founded in 2017 and located in the world yoyo machining center Shenzhen, China. R2FG stands for Rotation To Fight Gravity and they are making some really cool innovative designs. This is their flagship counterweight - The Reactor!

The Reactor is a machined plastic counterweight with a nice angular shape and soft rounded edges to improve durability and help with impacts to the hand. It can be attached with a bead to reduce string tension or with the groove around the center for quick and easy use.