We print these using a sublimation process onto the white surface. Both sides can be printed. The air fresheners will come unscented. You will need to use your own oils to add the scent you would like. Size is approximately 3.185 inches round All custom designs, requests are welcome. Previews for custom items will be provided for approval prior to a completed item being shipped. These are printed and pressed by hand and will be mailed out within three days of placing your order.