If it isn't obvious, this is a rotary tool accessory. I had one of these abrasive buffs from a set and used it for the first time cleaning off gasket material of a crankcase cover. It worked really well, but wore out quickly. Got a shock at the replacement value - $21.95 for a 2 pack at Bunnings! I think this price is fair value; RRP is a rip off, but I couldn't find any aftermarket alternatives. About as good as it gets according to the camels.
This is for the coarse and medium grit combination, the fine abrasive buffs are similarly priced if you need those.
Buy 4, save 10% off too.
2x Fine Grit also $6.80