Description The UV color-changing test card is a must-have for outdoor sports enthusiasts. Adequate supply, it is both portable and practical. The card is designed to intelligently remind you to apply sunscreen, making it a scientific and effective way to protect the skin from harmful UV rays. Features -Color:As Shown -Material:Plastic -Size:2.70X2.70X0.10cm/1.06X1.06X0.04in -This card changes color when exposed to uv rays, making it easy to use, very convenient to use. -With compact shape, lightweight and portable, take up no space and you can put it anywhere. -Practical use: Providing ample quantity, making these test cards a practical choice for outdoor activities. -Suitable for outdoor activities: Whether you're hiking, or playing sports, these uv testing cards are suitable for a variety of outdoor activities. -For testing uv effect, these uv testing cards are easy to use, simply stick onto the clothes to be tested and wait for results. Package List20 x uv testing cards