Most powerful kit in the series capable of handling elastics up to 3.6 Cable size, the use of 30 20 ton carbon allows us to have a tool with an almost unmatched weight action power ratio. All kits in the mv-r zero series come with a slot ring. All kits in the mv-r zero series come with a slot ring and are available in 2 pieces 2.95M and in 3 pieces 4.3M .