Smooth-On Body Double Trial Unit- Enough for 1 face and neck, for a whole medium size head and neck, 2 kits are necessary Body Double® "Standard Set" and Body Double® "Fast Set" are long lasting skin safe lifecasting silicone rubbers that can be applied directly to the skin to make molds of the face, hands and other body parts. The rubber cures quickly and will reproduce perfect detail from any original model - far better detail than any alginate. Click here for more info on the Body Double ACMI certification. One Casting or Many . . . For About The Same Price: Unlike alginates, which are good for one only casting, Body Double® will last for many castings of almost any material including plaster, Matrix Neo, wax, resins (Smooth-Cast urethanes, polyester, etc.), Low-temperature melt metal alloys, etc. And the amount of Body Double® used per mold is less than most alginates, so the cost per mold is about the same. Body Double® "Standard Set" for larger surface areas. Working time of 5 minutes and a demold time of 20 minutes Body Double® "Fast Set" for fast turn around. Working time of 90 seconds and a demold time of 5 minutes