This Solid steel shot for the advanced thrower features machine turned to different diameters, Lathe turned and balanced for an overall best performance. With its polyurethane paint coated for smooth and durable finish it will last the test of time. Shot Selection Criteria: Determination of the correct diameter is based on the fingers being in proper throwing position placed behind the shot. To obtain proper fitting of the shot to the ability of your athlete.1. Finger length is critical. The shot must rest on the Pad (callus) of the palm and the fingers must be up the side of the shot. Throwers with ''shorter'' fingers may find that the smaller diameter shot feels better at delivery & those with longer fingers may like the feel of the larger diameter.2. The final decision is a personal choice by the thrower and you may need 2-3 diameters to fit the whole team. From a Biomechanical point of view, the larger shots give a greater contact area & push zone.