Mafuken Bicycle Bike Trainers, Bike Front Wheel Riser Block Stabilize Bike Turbo Support for Indoor Bicycle Bike Trainer TrainingSpecifications: -Sturdy molded plastic with no slip feet -Dimensions: 9" x 5" x 2.5" -Provides 1 1/2" rise -For use with indoor bike trainers -Weight:175g/6.17oz Discriptions: The rise block is designed to keep your bike ..