We all know that these Dremel drums are insanely expensive, so such a large stack of drums and accessories was too tempting to pass up. The rubber centers are not really centered so some contact is only on one side. Others have exploded, making eye protection a real must. I've been using these tools for over 30 years (actually) and I understand how to cut or heat edges. This product is just crap. 5 Dremel drums will survive and leave no scars.