Features: High Quality Interchangeable Feed Rollers for Welding Wire MIG Machine Feeder System/MAG Welding. It is made by ball bearing steel, high and precise and durable, ensure long service life and smooth feeding. It provides very stable feeding by the pushing system, high efficiency even at lower feeding speed. The dimension of feeder roller (ODxIDxH) is: 30x10x10mm(1.2x0.4x0.4").2 different grooves for different applications:V-groove for carbon steel wire, i.e. ER70S-6, copper wire, i.e. CuSi.V-groove for aluminum wire, i.e. ER4043, ER5356. Specification: Color: Silver. Material: Chrome vanadium steel.2 different sizes for different wire sizes:0.6/0.8mm (0.023/0.03").0.8/1.0mm (0.03/0.04"). Type:V-groove 0.6-0.8/0.8-1.0mmV-groove 0.8-1.0/1.0-1.2mmNote:Due to the difference between different monitors, the pictures may not reflect the actual color of the item. Please allow 1-3mm errors due to manual measurement. Package Included1 x Interchangeable Feed Rollers