Gypsona Plaster Bandages remain the industry standard for making a fast, strong support shell specially in lifecasting applications. Gypsona Bandages are immersed in water and layered over cured alginate. The bandages dry and form a rigid support shell (or “mother mold”) that holds the alginate mold in shape during the casting process. Gypsona Bandages are available in a 4″ x 5 yards size, in single packs and a case of 12.