Sprit River Inc machining is unsurpassed and the plating is fantastic. They are proud to be known as the leader in quality on all our brass products like these cones. Each cone is machined on a screw machine one at a time. All are then tumbled to remove many of the machining marks...then they plate them with a high quality finish. Come in three finishes and four sizes. All packs contain 20 pieces except for 3/8 which has 15 pieces.