YOU ARE PURCHASING 10pr OF BLACK REAR SILICONE TIRES THAT IS MADE EXCLUSIVE FOR BUD'S H.O. CARS, INC. THESE TIRES WILL FIT THE STOCK REAR HUBS OF JOHNNY LIGHTNING & AUTO WORLD X-TRACTION ULTRA G CHASSIS. THESE TIRES WILL ALSO FIT YOUR ORIGINAL AURORA AFX MAGNA-TRACTION AND NON MGNA-TRACTION STYLE CHASSIS. THESE TIRES WILL ALSO FIT ON THE TYCO US 1 TRUCKING REAR STOCK HUBS. THESE TIRES ARE BRAND NEW. INNER DIAMETER = 0.236in, OUTER DIAMETER = 0.464in, WIDTH = 0.228in