Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Convenient way to strengthen hands and fingers

I got this idea from my son for whom I purchased a 9-lb per finger Gripmaser almost 2 years ago. Some of my fingers are getting numb when I wake up in the morning and I feel they are getting weak. So I got these to strengthen my fingers. I do it while working in front of my laptop and while driving (one hand at a time). I've noticed I am stronger and am able to open bottle caps and jars that I needed my son's help before. I recommend this product. Amazon.com always has fast and good service.