Our Double Bubble Glass Aroma Friendship Balls combine art and functionality in our newest glass art collection. Hand blown, these pieces are designed to hold scented oils. We have blown a bubble within the bubble and the inner bubble is open at the top. Pour in a few drops of scented oil. When hung in a sunny window, the oil is gently heated by the sunlight, allowing the fragrance to evaporate. We have handpicked fragrances that compliment each design and have included a FREE starter bottle of scented oil with each piece.Each hand blown glass Double Bubble Aroma Ball is completely handmade. The size is approximately 4 1/4″ diameter at the widest point by 6 1/4″ tall. Although made to design, each one will have uniqueness one would expect from a true handmade glass art object. Variations in color patterns, size, and color saturation may be evident from the shown photo. Comes with a decorative swirl hanger.