Due to fluctuations in moisture content some units may be lower than the mass advertised. We are currently working to update the packaging to reflect this however the amount of wood packed per box does remain constant with a small unavoidable tolerance. Ooni Premium Hardwood 13cm (5?) Oak Logs are made from 100% oak hardwood from sustainable sources. Our hardwood kindling is free from chemicals aromas or additives for a pure fuel that infuses your dishes with all-natural flavours and burns for longer. Perfectly sized for Ooni Karu 12 and Ooni Karu 12G. Simply keep 5 or 6 pieces of kindling burning at a time for consistent heat. Each 7-8kg box will last enough to cook dozens of pizzas. Our Oak Logs are kiln dried and FSC certified. Please note wood logs are a natural product that comes in varying shapes and sizes. What you receive may differ from the images shown on this page but they will fit and fire your oven regardless.