We carry Turbo Switch Grips in the shop. I use them, along with several of our customers. I have had no problems with them. I really like being able to change balls on a moment's notice and have exactly the same feel.
One of our bowlers who uses these is a major strapper, and he has broken two of them, due to the torque he applies to the ball. For most bowlers, this is not a problem.
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RW (THB)