Click to expand Tap to zoom Busch 7536 Stone Boulders 320g by Busch Save £-2.75 £2.75 | / SKU Busch 7536 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart A 320g bag of Quartz Stone BouldersStone size approx. 4mm - 8mm