Mid-low quality consistent with price. Good choice if you need something to help with a specific project and expect to throw away when you're done.
I used it in a shared work shop that normally only has 80g on the sanders. It worked, it lasted, for my mid size project. But, I left it installed on the sander (there are others in the shop with 80g), and within 10 days it was worn out and had multiple burn streaks.