The sander actually becomes flat when pressed against a flat surface and round when pressed against a round surface i.e. the sanders conform to the underlying surface. Consequently the sanders should be filled with very little air.
The #130 Drum has a 1 1/8" Diameter and is 3 1/8" long with a 5/16" Dia. Shaft.
This is the most revolutionary sanding system to come out in years. Guinevere uses inflatable rubber sanders, each with four sanding sleeves. They can be fitted either to a flexible shaft or the quiet 1⁄2 HP motor. Watch our Video ...see below!