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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 YoYoFactorys 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: 4.3mm Width: 42mm Diameter: 56mm Bearing size: CBC Spec Bearing .250x.500x.187 Weight: 63 grams