SecureFit threading provides tight fitting with zero pressure loss; Made of aircraft quality 17-4 Stainless Steel; Canoe Porting reduces recoil and muzzle jump; Stud Ring holds the wad cup for a fraction of a second to create the tightest and densest patterns; Heat treated for maximum durability and coated in a titanium, non-reflective bronze finish; 3-Phase Constriction equates to more downrange energy; Made in the USA