Not too harsh on the arm. A thicker felt compared to the regular Wilson Trinity pressureless balls. The cardboard containers are environmentally friendlier than the plastic ones, but an even better solution would be to simply sell them in a single box without the individual 3-ball cardboard containers. Prior to the Wilson Trinity Pros, I purchased 72 of the regular Wilson Trinity balls, which came in one rectangular cardboard box. So, don't know why the same isn't done with the Trinity Pros. Again, a nice pressureless ball, but if you plan on using them for serious groundstroke drills/practice/match play, I feel the bounce just isn't close enough to a real non-pressureless ball, if you're a solid 4.5 or higher player. Note: I understand being a pressureless ball, it will "not" have the exact same bounce as a non-pressureless ball.

Love hearing the THWACK! And the packaging being recyclable is a bonus.

I like the way the balls play. Some feel they are heavy, but most of us thought they were great.

Received the order quickly. They were packaged the same as normal pressurized balls (not available loose in a bag). This made for a bit of a pain to open and pour into my ball machine but not a huge deal. Everything else about the ball is great.

They last twice as long as pressured balls do. Consistent quality. Two bad balls out of a case which is a great percentage. Highly Recommend.

Trinity Pro plays more like a Penn 2 or Wilson than the original Trinity's. Great balls!