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 units�in the UK. The PENROC 240 bags are�equivalent to 4.7 boxes of PENROC. PENROC 240 BAGS; weight 11.2 KG Grill area coverage 690 x 980 mm (6,762 sq.cm)