Light-gauge flexibility, heavy-gauge durability. Dava Rock Control Picks feature a larger control area and insert molded tips for the best sound. Made from Delrin, a very smooth material that glides over strings for a fast action and is used by rock, jazz, and fusion players. Dava's multi-gauge grip gives you the dynamics of multiple pick gauges on the fly--simply choke up on the tip for a hard gauge or release the flexible center section for a soft gauge.Dava's Grip Tip picks are a revolution in design. Utilizing patented over-molding technology and multi gauge flexibility, musicians not only get a velvety rubber feel and unparalleled grip, but also the ability to change pick gauge on the fly. Grip the tip for a hard gauge or release the flexible center section for a smooth rhythm feel.