Ya know I bought a few hundred of those little drums from BG and they work okay, but last about 1/10th as long as the dremel brand ones do. I'm thinking they aren't worth the money savings. I spend wayyy too much time changing them out every 5minutes of use. My garage floor is littered with them! I can blast through 20 of those little things in an hr. They must use some cheap rice glue to stick the abrasive to them. Whatever the stuff is, it's weak at best. If I buy a little box of 5 dremel drums in the blister pack, I'll have them for 2 months.