They catch fire immediately and maintain excellent temperature at the barbecue, as they have great burning power. They are durable and do not wear out easily. However, I noticed that they do not produce enough thick, dense, white smoke for the smoky aroma I desire. I tried them at temperatures of 60, 65, 70, and 75 degrees Celsius, but the result was always a light, aromatic smoke that was relatively weak. I would like them to create a denser "fog" once they reach the appropriate smoking temperature, rather than just a light layer of smoke.