IT IS USED TO MAKE YOUR AUTO GET MORE FRESH AIR AND PROMOTE YOUR BRAND WITH CUSTOMIZED IMPRINTING. THE FRAGRANCES ARE AVAILABLE WITH MANY SCENTS FOR OPTIONS. THEY ARE ADJUSTED AND MIXED PER SPECIFIC PORTIONS TO MAKE SURE PEOPLE CAN ENJOY THEM AND ENHANCE THEIR MOOD. CAN BE CHANGED SHAPE ACCORDING TO CUSTOMERS NEEDS. 3" DIAMETER X 5/64" H