Koda XCEL Billiard Ball Set. The Koda Xcel Billiard balls were designed for billiard enthusiasts new to the game. The goal was to create a value + set that gave our customers great balance, weight, spherical consistency, hardness, and color at an affordable price. The KBXB billiard balls are regulation 2-1/4″ diameter and sure to build confidence in your game.