The MP-ONE PRO features a dynamic nonlinear response to create a forgiving and consistent plunger. No mechanical parts and quality materials are less affected by rain and temperature when compared to traditional plungers. 20 micro clicks per rotation without the use of tools, makes this plunger easy to adjust on the go. An extra set screw is included if you would like a more sleek finish after tuning. Lasered marks on the cap and body make it easy to see when and where you need to make an adjustment. Includes a metal wrench to tighten the plunger to your bow.