Prepare yourself with your penguin flaps as we plunge into the mystical world of flexible abrasive flap discs! Flexible abrasive flap discs are construction out of either emery cloth or flexible polymers such as rubber. This makes them able to bend. This adaptableness facilitates placement of the drum over uneven surfaces which is important for workpieces that are complex. In aerospace, the discs can serve for the grinding and finishing of complicated geometric forms like turbine blades. Flat sanding discs are called flap discs and they are used for woodworking to sand or shape curved pieces like the legs of chairs or for the bodies of musical instruments. The flexible flaps make sure that uniform abrasive contact is achieved while avoiding over sanding in certain spots.