The Edelbrock Uni-Syn Motorcycle Carburetor Balancing Instrument is a precision instrument that provides a visual method of balancing multiple carburetor setups with a high degree of accuracy. This uni-syn A instrument includes 1 and 2 barrels with a round top. The balancing tool material is made of aluminum with a natural finish. The weight of this instrument is 0. 60 pounds. Instructions are included.