14 gauge (what is 1.628millemeters) is the most popular size of the piercing opening in all types of piercings including piercing of the tongue. 14 ga straight barbells with balls, half balls, disks, cones, koosh balls made if acrylic, bioplast, titanium, surgical stainless steel, PTFE material and others are here for you! Find the magnificent combination of your style, favorite color and material and your piercing size and enjoy your perfect tongue ring.