This is the Kimber 45 ACP Kimpro Tac-mag 8rd. Magazine Stainless Steel. Fits most 1911's. Heavy gauge highly polished stainless steel magazine tube. Heat treated for ultimate strength and freedom from distortion. Super glide Teflon coated extended stainless follower. Pure rocket grade wire springs, heat treated and corrosion resistant. Ultimate round recognition from enlarged holes and numbered markings. Made in the USA.