This is the classic double bass transport wheel. A hard to puncture pneumatic tire and a ball-bearing axle makes for smooth, reliable operation. Features: • 6-inch pneumatic tire on solid wheel. • Ball bearing axle shaft. • 10mm (3/8-inch), 3.5-inch long endpin shaft. • Two sided bicycle-style fork. • Custom spindles for 12mm and 12.7mm can be obtained. • This shaft is removable and can be changed for another sized pin if needed.