This is a pair of optional HPI Racing Molded Inner Foams for the rear of the Baja 5B line of 1/5th scale buggies. These are molded foam donuts that help support the tire for stable performance. The "MS" compound is firmer than the stock foam donuts, giving the steering a precise feeling when making sharp steering transitions. Sold in pairs. These are for use with the 170x80mm HPI tire.
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![HPI-4812 HPI Molded Inner Foam (170X80mm/2Pcs) [4812] HPI](http://ultimatehobbies.com.au/cdn/shop/files/HPI-4812.jpg?v=1758060953&width=500)