Kyosho 8x16x5 metal shield Bearings used for the hubs and differentials in the Inferno MP9, MP777 and MP 7.5 series cars and trucks. This includes the Inferno MP9, Neo, VE, MP777 WC, STRR, GT and GT2, the ST and ST2 US Sports truggies, the US sports buggies. These stainless steel high quality Japanese bearings offer extremely low rolling resistance. Mush lower rolling resistance than almost any other bearing on the RC Car market today. Very precise with little or no slop these bearings also outlast most Chinese and Taiwanese steel bearing several times over. Our infernosonly.com race team has raced an Inferno MP777 a complete season on 1 set of these stock Kyosho bearings in our car with zero failures. Regular bearing maintenance should be done on your car regardless.