Pini Kay / Shimada Briquettes 10kg Shimada Briquettes made of hardwood burning with a very hot flame, produce exceptional heat output due to the center hole providing extra air flow to sustain the combustion process. The heat logs are very dense and stay intact, do not swell nor expand while burning, are easy to stack, and do not roll inside the stove burning chamber. The wood briquettes type of eco logs are produced under extreme pressure and heat.