Isle Laboratories Inc
Model Landscape Kit

Walthers Part # 473-701, p. 355 Walthers 2012 HO Scale Reference
A scale, $60.55, currently in stock at Walthers

 
Make your own foam castings and rubber molds. Perfect for use in the field, using real rocks as masters. Includes one pint each of Polyfoam "A" and "B," latex mold compound and mold release.