The RAPID MILL™ composite frac plug uses a ball drop procedure to isolate hydrocarbon formations for multi-stage frac operations. Mostly used for horizontal operations, the slim lightweight design makes deployment fast and efficient in vertical or horizontal wells. After setting, the Rapid Mill™ remains open for fluid flow and allows wireline services to continue until the ball drop isolation procedure has started. Once the surface-dropped ball is pumped down and seated in to the inner funnel top of the tool, the operator can pressure up against the plug to achieve isolation. Comprised of proprietary composite material and having a low metallic content, the Rapid Mill™ can be quickly and easily milled and circulated back to surface using conventional milling, drilling with a rig and tubing, or with coiled tubing.