1/2-inch diameter to fit perfectly on your essential oil caps Easily identify your essential oils from the cap Color coded Smear proof, oil-proof, and waterproof. Easy to peel and has great adhesive These stickers are color-coded and labeled to match your essential oil bottle. The cap stickers allow you to easily identify your essential oils from the top of the bottle. These stickers also have a great adhesive, so you don't have to worry about your stickers coming off the top of the caps. 154 Stickers per sheet.