Replace your Lava rock with PENROC For the authentic aroma of charcoal barbecue. PENROC is designed to replace the lava rock on your gas barbecue giving you the authentic aroma of a charcoal barbecue. The distinctive design of PENROC allows the fat from your cooking to simply roll off. This prevents messy clogging and minimises the chance of flaring. PENROC is manufactured using slate and ceramic with a mixture of fine oakwood particles and purified charcoal. The mix is then hardened to the distinctive PENROC shape for long lasting and hard wearing use. Lava Rock (Lavasteine) replacement for Catering Chargrills & BBQ'S (Gas or Electric). PENROC has sold over 2+ million items in the UK. The 6 Litre 120 tub is equivalent to 2.35 boxes of PENROC. weighs 5.5 KG. Grill area coverage 490 x 690 mm (3,380 sq.cm)