When the Quad came out it spawned several individuals that came out with their own designs. One was DIP, others were marketed on Gunbroker and some even pedaled their knobs here. Materials ranged from aluminum, stainless, blued CM, even Brass. Problem is most are the clunky looking tactical knobs. Big, bulky but functional and make your nice slim Sako look like it has a tumor growing off of it. When Sako came out with the Finnfire II with the Finnfire style knob I'm thinking, this is good, we'll finally get a nice looking ala P94S style knob. Good luck on finding one in the states, and if you do it will run you close to 100.00 by the time you pay to get it over here. I own a couple DIP knobs and a couple of these bought off of Gunbroker, picked these up for slightly less than 35.00 with shipping.