"Arcola" is a bi-color kugel made with transparent Iris Blue and transparent Gold Topaz. Use your favorite scented oil or the included complimentary bottle of "Stress Relief" scented oil. 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.