Done to supplement the elite training. elite gel block of the front wheel guarantees stability, security and strength while he trains. hometrainer gel block maintains the bike in a balanced position and flat making training a more realistic experience. the basis of the hometrainer is made of rubber of high grip that prevents unwanted displacement and annoyingvibrations. Gel riser block designed for bicycle trainers Keeps front wheel secure while you ride Nonskid rubber on bottom surface Elastogel insert holds tire securely