What Diameter? The first consideration here is the size of your hand and choosing a boule comfortable to you. Try holding the boule palm down at arms length with little or no help from your thumb, your fingers should wrap just over halfway round the boule and the boule should not be slipping from your grasp. If it is slipping it could be an indication it is too big. This will cause problems when you throw as the boule will tend to slip as you throw. This will affect your control over the boule thus the direction and distance the boule travels. If, however, it is too small for your hand you will not be able to release the boule cleanly from the fingers and the same problem will result. The simplest way to choose a boule is to start with a small boule and work up until the boule feels too big and then step down a size. When you reach a stage in your play when you need to specialize then you will find the pointer tends to use a smaller heavier boule and the shooter will choose a larger lighter boule. This is a general rule. Do not escape from the fact that it is the most comfortable boule which will bring the best results.