Tube Carriers feature new ergonimic lightweight design. This patented design is the optimal carrier for comfort and adjustability. The new tube carriers are adjustable to fit the smallest student to the largest. Features include: Aluminum belly plate – Lighter and stronger than traditional materials Aluminum tubes – allow infinite torso height adjustment and tow-in adjustment (angle front to back of tubes near the shoulders) Shoulder Rotation – Adjustments can be made to the camber (left and right), Caster (back to front) Adjustable back bar – Facilitates easy shoulder adjustment with back bar support. Adjustable back bar only available with marching tom set carriers.