Energetic Armament SONUS, 9MM Suppressor, 9.8 Ounces, 6.6 Length, 1.54 Diameter, Welded Stainless Steel Core, 1/2-28 RH Direct Thread, Compatible with Othe Mounting Hardware, MetOX Finish, Burnt Bronze EA12 Utilizing 17-4 Stainless Steel heat treated to over H900 condition, the Sonus is engineered to be ultralight at only 9.8oz without sacrificing durability. The precision engineered 17-4 design allows for thinner walls which not only optimize low weight but also increases internal volume while maintaining a smaller outer envelope.