The 6" x 3/4" Surge-Sharp leather clad wheel is a plywood wheel with leather bonded to the face. The plywood is trued on a lathe; then the leather is trued after it is bonded. The wheel will fit 1/2", 5/8", 3/4", and 1" shafts.
Many people choose the wheel with leather on the face only and attach sandpaper to the sides with disk cement. Be sure to keep cement off the leather, center bushing, or hole.
A popular combination is two wheels, one with 320 and one with 600 grit wet or dry paper on the sides of each wheel. Then apply a gray (aggressive compound) to one wheel and red (fine compound) to the other.