Here at The Green Man, we have tried many different incense charcoal brands for our incense blends. It is our opinion that Three Kings is the best quick lighting brand, and that is the brand we sell to our customers! Each roll contains 10 disks, and the larger size is 40mm. We recommend you keep your charcoal as dry as possible for best lighting ability. You can do this by keeping it in a ziplock bag, or in a tightly lidded glass jar.