The Synergy proto is here for testing and has been released by YoYoJam in order to get feedback. The yo-yo is the first pre-production free side spinning yo-yo released to the public. It's very unresponsive and is meant only for advanced players. You need to be good with your hands or this thing can be very frustrating. Keep in mind this is a prototype so there will be a no return policy on these. They took the spinning stack kits to a new level by making the entire side caps spin opening up an entire new style of play.