Top quality Welsh Anthracite for roomheaters only. Around 2 inches in size, produces very low ash and is very hot. The ratings below are given to help you decide which is best for you. 3 spots = Excellent, 2 spots = Very Good, 1 spot = Good. Product name Stovesse 1 Heat Output • • • Burn time • • • Ease of lighting • • Smokeless Yes Suitable for Roomheaters