FieldSTONE- Mossy Rock Boulders Mossy Rock Boulders are primarily brown and gray with moss and lichen. The boulders range from 3' x 3' up to 6' x 6' and are available in both round and flat forms. These stones are palletized one piece per pallet and are sold by the ton. AVAILABLE SIZES DESCRIPTION SIZE   Boulders, palletized 300 – 500 lbs   Boulders, palletized 500 – 4,000 lbs