As someone who frequently works with abrasive mounted points, I can attest to the quality of this sandpaper. Through trial and error I found that 150 grit is ideal for smoothing out rough surfaces, and the WEN brand delivers every time. The sandpaper is durable and long-lasting, ALLOWING me to use it for multiple projects without having to constantly replace it. The only downside is that it can be a bit on the pricier side, but it's worth the investment for industrial and scientific use..See full review