The Tecnifibre X-One is made with 72% real felt. The result is that the felt lasts longer than any other balls on the market. After about 20 minutes of heavy hitting by 5.0+ level players, you will see the balls “fluff up” though the fluffing is not the same as lower end balls. Contrary to what many players think, some fluff is good because it causes to a ball to “bite” the air more when spin is applied. Naked balls that lose their felt quickly are more aerodynamic and therefore will move faster through the air. So while too much fluff is undesirable, so is a ball with little remaining felt. This case contains 18 cans with 4 balls in each can.