Zero Wood Oak Heat Log Briquettes 5kg are made from 100% natural, chemical-free hardwood sawdust. These briquettes burn with a very hot flame, providing exceptional heat output due to the centre hole that enhances airflow and sustains combustion. They are dense, stay intact without swelling or expanding, are easy to stack, and do not roll inside the stove's burning chamber. Produced under extreme pressure and heat, they are ideal for wood burners, multi-fuel stoves, open fires, and chimeneas.