This 25kg bag of ballast is an equal measure mix of 10/20mm gravel shingle and sharp sand. Ballast is a building material most commonly used in the production of concrete but can also be used as a strong base for bedding, paving, etc. As the shingle is naturally sourced, there may be a variation in shape, colour and size of the stone. Features & Benefits Use with cement to create concrete Can be used for a strong base in many projects, such as paving, bedding and making up levels Locally sourced Domestic and commercial use Product Specification Material: 20mm Gravel Shingle / Sharp Sand Product Weight: 25kg