Add to cart C1285 Natural Extra Coarse Talus Rock Debris $4.50 This is a bag of extra coarse rock debris that is white in color. The rock debris is lightweight material to model rock debris in streams, fields and many other places. You can mix and blend sizes and colors for maximum realism. The bag has 21.7 cu.in. and the rock size is about 1/2″. This Talus is made by Woodland Scenics.