Rottafella Xcelerator 2.0 Skate Junior - Rottefella Xcelerator Junior Skate is a racing binding for young racers. The binding helps improve ski control during training and competitive racing. The included NIS key allows you to move the binding forward or backward depending on snow conditions, terrain and technique. The binding is set to a medium flex, which can easily be replaced with a harder or softer flex. The Flex is a flexible pad that provides bending resistance and helps you control the skis. Rottefella Xcelerator Junior Skate is suitable for skate skis with NIS mounting plate.