The Blue Slate Decorative Aggregate from Kelkay makes for a beautiful looking addition to your garden. Slate chips are 20-40mm size and are glossy when wet. A great way of decorating your borders and beds, alpines and rocks gardens and a water tanks when washed. It is recommended that a minimum depth of 35mm is used when calculating how much you need. This item will be delivered with care and will need someone to supervise its arrival, due to its weight. Due to this product being made from natural materials, coverage distance may vary. We have calculated that this bulk bag will cover approx 8-12m² Multi-purpose Fish Friendly Ornamental or practical Highly decorative Size 20-40mm Bulk Bag (approx 750kg)