We purchased these brushes for industrial and SCIENTIFIC use, hoping for quality abrasion tools.Instead we were met with disappointment. The bristles fell out within just a few uses, leaving our team with a messy and ineffective cleanup. The only positive about these brushes is the affordable price point. However, that does not make up for the wasted time and resources spent using them. We do not recommend these brushes for any serious abrasive or finishing work..