The freedom of riding, indoors.Experience a new freedom on your indoor trainer. The JetBlack Turn Block has been designed to level the front wheel whilst allowing freedom of movement. This provides a superior indoor riding experience on any indoor trainer.A superior indoor riding experience. Eliminate Stress On Your Body And Equipment. Specification: Stylish sleek design,No assembly required,20 degree turn capabilities either side,Neutral 3cm wheel height to suit most trainers.