I have been using Dr Grip series over decades.
It was must-have item when I was in elementary to high-school in Japan. Great
grip, shaker function, and cool colors. Only con is that its grip gets
yellowish, sticky, and dirty over 1-2 years. I guess, you can buy a new Dr.Grip
every 1-2 years. Also, you can personalize it by inserting small-sized
photo/art. I inserted a picture of my cat.
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