Yes it it's an abrasive net, Abranet from Mirka. It is an open weave fabric that works with a dust extraction system. It comes in all sorts of formats to match a multitude of hand sanders, orbital sanders. It started life in Mirkas automotive product ranges, but what...

I'm OK with the sound of crickets when posting on Nostr about #paint, #kitchenpainter #decorator... In 2009-10 I spent 12 months religiously writing 3 blog articles a week describing the work my company was doing. Nobody read them. I was on Twitter and had very few followers...