The YoYoFactory Grind Machine yo-yo is the next generation in yo-yo performance. The Grind Machine is the first non-metal yo-yo to feature YoYoFactory's patented triple bearing hubstack technology. Combine this with a modern shape, textured grinding surface, silicone response, the large Central Bearing Co. SPEC bearing, and you have one of the highest performing plastic yo-yos in the world!Ready for unresponsive "slack" play right out of the box.This is an advanced Yo-Yo; not for beginners. You need to do a bind to get it to respond.Specs:Gap Width: 4.3mmWidth:  42mmDiameter:  56mmBearing size: CBC Spec Bearing .250x.500x.187Weight:  63 grams