These WWTS cartridge grips are made from aircraft aluminum. Adjust your needle swing wih a simple twist of the grips. These grips current are available in 1" inch and 1.25" Inch. They are also available in a variety of colors. Fits machine like: Cheyenne Thunder or Spirit, FK Irons Halo, Edge X, Direct, & Inkjecta. Any machine that has that twist lock on it.