Wire comes in different size gauges. The larger the gauge number, the smaller in diameter of wire. So, a 26-gauge piece of wire is thinner than a 16-gauge piece. For simple wire bending projects, you would probably use wire anywhere from 14-gauge to 26-gauge. 18-gauge and 20-gauge are the most popular sizes for simple wire shapes. 24 to 26-gauge work best if you want to add beads to your work.