This pack of 3 Aroma Bars is to be used in Lulu Candles' Aroma Bar or Aroma Beam Scenting Machine. Each square is individually wrapped and sealed to keep your scent fresh. Once loaded onto your machine, each square will fill your space with your favorite Lulu Candles fragrance for up to 30 days. Each square is handmade in the USA using the finest essential oils fragrance oils blends. One bar should be enough for scenting 250 sq feet, but add more bars for stronger scent throws or larger areas.