Features: Easy to Use : Chewing triggers the release of natural aroma , without complicated equipment , so that you can use the olfactory SPA that can activate thinking at any time when commuting on the subway , working overtime late at night , and preparing for exams. Safe and Chewable : Replace bad habits such as biting nails and gnawing pens with safe and chewable silicone sticks , and is a caring partner to protect the details of life. Silicone Material : Made of washable , high toughness silicone material , it does not require battery consumption and consumables replacement , and integrates health concepts. Material: Silicone. Size: 10×1 cm / 3.94×0.39 inch