All Control Picks feature Dava's unique Multi-gauge grip, allowing you to change pick gauge on the fly simply by the way you grip it. Choke up on the tip for a hard gauge, or release the flexible center section for a soft gauge. It only takes a minute to get the hang of it, while at the same time you'll find all of the nuances in between. Dava's Rock Control Picks with their larger control area and insert-molded tips are all about sound. The red-tipped model is made from Delrin, a very smooth material that glides over the strings for fast action. Delrin picks are most often used by rock, jazz and fusion players.