The Zapper 300 features top loading convenience and full containment of the arrow shaft for the perfect bow hunting rest. The rest delivers unconditional value and excellent performance in any bow-hunting situation. It is easy to tune for any size arrow. Arrows zip silently through the unique adjustable stainless steel Speed Fins on silencing tape (4 strips included) with increased speed and no damage to the fletching. The rest cradles and supports the arrow shaft as well as hold the arrow securely in place so that no matter what conditions of terrain or weather, no matter what the angle of the shot, you have perfect arrow support from the instant of release to the second your arrow clears the bow. The Zapper 300 has 2 support fins and 1 bottom fin, and is for arrows weighing up to 550 grains. All Bodoodle rest components are made of 6061 aluminum and quality materials. Weighs 2.4 ounces.