The Durablock AF4404, Round Block is designed to sand and block highly curved surfaces.
Dura-Block AF4404 Hand Sander 11" Tubular Round Block
Trade Associates (AF4404) Dura-Block 11" Tubular Sanding Block AF4404
Durablock AF4410, Marine Block
Durablock AF4409, Long Block
Dura Block AF44A 6 Piece Sanding Block Set AF4400 AF4401 AF4402 AF4404 AF4405