Composite toe slider compound lasts up to four times longer than plastic-based sliders. Magnesium slider does not get hot. Gives excellent feel and feedback; adds leverage when maneuvering the bike around corners on the track. The slider of choice for AMA Superbike British Superbike and World Superbike riders. Can be used on Alpinestars Supertech (up to 2015) SMX Plus (not for SMX Plus 2011-2015) SMX-R and SMX-4/ SMX-4 Stella boots. Sold in pairs.