I have been using the 3M brand for 5 years. I use the 3M version every day and they last for months. They are made of harder plastic and last 1/10 longer. The 3M brand is 50 grit and they say they are 50 but more like 80. The white that says it is 120 grit is more like 200. I will use these because they are so cheap are, but I will never buy anything else 3M in the future.
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