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This is the second time I've purchased these cups, they're that good. The ridges provide a very secure grip for my 90 year old mother and she keeps one in the bathroom, bedroom and kitchen. Loves them.
My wife and I have been using these cups for several years. They are great for everything and I find it's the only cup I want to use. The grip is so comfortable. We just bought more for the boat this summer.
This is the best grip cup on the market. Marusya Inc has wonderful products and I've been a fan for years.