A gel patch that easily determines your alcohol tolerance. The gel patch and instructions will be enclosed and sent to you. If you are concerned about the effects of alcohol, you can easily check with this. Package contents: 1 test gel patch Patch size is approximately 5cm x 3cm It has been stored at home in a well-ventilated place away from direct sunlight. I have 7 more of the same item, so please consult if you need them.