The 8 Wheel Balance Core System frames feature the proven design of the Balance frame with improved groove and split. The balance frame is also the 2nd frame ever to feature an unbreakable aluminum core with replaceable plastic outers making this the only frame system able to out last your skating career. These frames are also compatible with all Core System frames. Sizing: MEDIUM - FITS BOOT SIZE 7-9 LARGE - FITS BOOT SIZE 10-14 Sold in pairs. Hardware is included