These 4 Bar boxes are the perfect gift, as they come beautifully wrapped and give the receiver a range of scents to try. All BotanicMelts melts are made using ECO-friendly soy wax and vegan and cruelty-free fragrance oil. The fragrance is strong and long-lasting. So, you can re-burn the melts multiple times and still smell the fragrance. For maximum fragrance, I'd recommend using 2 squares at a time.