Tennis Ball Review: Tecnifibre X-One Ball I have mixed feelings about these balls. The bounce test came in at 25 inches (~63.5 cm) before and after playing for 3 hours. The consistency is impressive given the weight differences. The weight test came in all over the place from 56g to 59g. Personally… had a love hate relationship with these balls. They’re very soft and have so much feel off the strings. The first 10 minutes is a an addicting feeling… however, that feeling fades quickly once it fluffs up. It then becomes insanely slow. Great for long grinding rallies… but not great for people that like to hit hard and finish points. I rely on my serve… and it felt impossible to ace with them. After cutting them open, I noticed large chunks of glue in every ball. This will definitely add a rattling noise when it breaks off! Concluding remarks: for the price ($140/case) I was disappointed in both the playability and the quality of the ball. However, if you want longer rallies on a ha...