These pens work great. I recently bought 4 more handles to replace the old style that slides on the front edge of the glass top. I don't understand why people are leaving negative reviews for this product. By thoroughly cleaning the jar, determining the exact spot you need it, removing the backing from the handle, and applying firmly to the jar, you'll have a comfortable grip that will look good and last for years. I have 12 tanks and 8 of them have Aqueon grips. Now I have these handles on all. I've never had a problem and haven't had any of my original 8 and some of them for years. I highly recommend this pen.
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