The 'Type F' belts are special formulated for longer durability comparing to other brands on the market. These belts are ideal for long runs under extreme conditions.
For Tamiya 417series, XRay T3/4series and Yokomo BD5/7series "Rear Belt Reinforced Type F for 417/T3/T4/BD5/BD7 B-03-VBC-0103-189"