Used but in good, fully functional condition! The Gaines Bass Wheel was designed to allow double bass players to safely and easily transport their instruments. The eight-inch diameter pneumatic tire (with inner-tube) absorbs damaging mechanical shock and prevents it from reaching the bass. The tire is mounted in a steel yoke, with a shaft that is inserted into the endpin holder. The wheel orientation is adjustable and the shafts are interchangeable. The wheel inner-tube has a standard fitting for a hand-operated tire pump. Heavy-duty shielded ball bearings and top-quality fasteners and set screws ensure that the Gaines Bass Wheel is a safe choice for traveling professional bassists.