This is the Ruger P85, P89 9mm 20-round magazine, manufactured by Mec-Gar.

It also fits Ruger P93, P94, and P95 pistols.

This mag features a high-impact polymer follower, a heat-treated carbon steel tube, and a high-impact steel floor plate.

Mec-Gar magazines are made with the most sophisticated technologies and best materials.

Made in Italy.