Natural Scenics Pea Gravel Pea gravel suitable for all gauges. Our construction scenics are manufactured from natural materials sourced in the UK. They are prepared and graded to provide consistency of product and are suitable for all scales. These materials give added realism in the construction of scenic landscapes, dioramas and war-gaming. Small pea gravel is approximately 3mm - 9mm sized stones Large pea gravel listing where the larger sized stones are approx. 5mm - 15mm available in packs of 150g