The Taylor's & Company Uberti Cattleman Spring Kit is manufactured by Uberti for their New Model Cattlemans. All parts included are steel. Refer to the full view schematic picture labeled with reference numbers for part location. Includes: (1) #18 coil hand spring, (1) #19 flat trigger & bolt spring, (1) #20 mainspring, (1) #135 ejector rod spring, (1) #136 loading gate spring, and (1) #137 cylinder pin retainer spring.