Our products are all handmade with 100% natural soy wax and natural mica powder colours which give the wax a pearlescent sheen as it melts in the burner. We would recommend using all 10 hearts for a large room, still giving up to 8+ hours burn time. You can even mix & match fragrances, for example pineapple & coconut with up to a maximum of 10 hearts. With the snapbars, just snap off the required amount that is suitable for your burner and the size of the room. As our products are all handmade, on occasion they may slightly differ in colour or packaging.