Review on Sackorange 60 PCS 6-Inch NO-Hole PSA Aluminum Oxide Sanding Disc: Versatile Self Stick Discs for Professional Sanding & Finishing (Includes 10 Each of 80, 100, 120, 180, 240, 400 Grit) by Brion Pine

I bought them a while ago and they have been in their original packaging ever since. I started using them about 2 months ago. Glue is terrible. After attaching it to the wheel with a self-adhesive film, it stays put for the first few uses. After that, the grinding wheels fly off the machine every time it starts. I have learned to press the discs down before starting the grinder so the discs don't fly out. It is now possible that the adhesive has dried from storage but there is no indication of this and when I peel the backing off the adhesive it seems quite normal. Discs are not durable. I use them almost exclusively for small pieces of wood or acrylic. after about 8-12 pieces the abrasive disappeared. Most of these pieces are less than 1" square and I usually have to grind 1/16" to 3/8". I won't be buying them again.