HPI Racing Inner Foams are original equipment on the Baja 5T line of 1/5th scale trucks. These are front foam donuts that help support the tyre for stable performance. The foam strips should be glued together with contact cement for proper performance. Sold in pairs. #4804 INNER FOAM (SOFT/190x60mm/2pcs) (for front tyres) #4817 MOLDED INNER FOAM MS (190x60mm/2pcs) (for front tyres) #4818 MOLDED INNER FOAM MS (190x70mm/2pcs) (for rear tyres)