Soft NO. 4 - (Orange) is used to secured a completely adapted impression under natural masticatory pressure. It leaves a finished surface and registers fine tissue details.
Soft NO. 3 - (Red) is for minor tray corrections and as an initial lining to stabilize the tray.
Hard NO. 2 - (Yellow) is used in rebasing as a hard foundation for Korecta - Waxes No 3 and 4 when extensive absorption necessitates a bulk of material. Also used to restore occlusion in partial denture .
Extra Hard No. 1 - (Pink) is a reinforcing material used Only on the external surface to support wax extensions beyound tray margins.