BK Rotor Shaft S12.3LV4 for DR-HPM Motor [DR-HPMR-V4] SHIBATA DR GRK VR4.3 This is an optional rotor shaft. This product, which has a special black coating on the rotor shaft body, improves wear resistance, assuming the recent drift scene where high rotation is often used. Depending on your drift style and feeling, we have prepared two types of magnets: the conventional "S12.3-LV2" type, which has punch in the high-speed range, and the "S12.3-LV4" type, which newly improves the throttle feel in the low to mid-speed range. *The rotor specifications are the same except for the different magnet characteristics.