This Ruger 9x19mm caliber magazine is made of blued steel. This 17-round mag is compatible with Ruger SR9, SR9c, and 9E.
Specifications:

Caliber	9mm Luger
Capacity	17
Finish	Blued
Model	SR9/SR9c
Material	Steel
Type	Detachable
Model Fit	SR9/SR9C
Brand Fit	Ruger
Max Capacity	17