Lava stones are always made of the same material, namely cooled volcanic rock. However, lava stones come in different sizes. Lava stones are not only used for barbecues, they are often used in the garden for decoration or as a substitute for topsoil. In addition, the stones are made into jewellery or used as decoration in aquariums. The size you should buy depends on your barbecue. The most common sizes for lava stone barbecues are: 32 - 56 cm or 40 - 120/150 cm. If you want to buy new lava stones, it is best to orientate yourself on the lava stones that were included in the delivery.