MATERIAL: These contact lens cases are made of plastic. The smooth surface of this contact lens container helps prevent damage to your contact lenses. USEFUL AND PORTABLE: These contact cases are small and portable, making them easy to carry in daily life. Their compact size allows you to place them in your purse or pocket. ASSORTED COLORS: These contact lens cases come in a variety of colors. Each package includes three colors, allowing you to differentiate your case from those of friends and family. You can also use different cases for multiple lenses. EASY TO USE: The lids on these contact lens cases are easy to open and close. Each case features a clear "L" or "R" mark on the lid to distinguish left and right lenses. You can also identify left and right by the different lid colors. DAILY CARE: Clean the contact lens case before each use. It is recommended to replace the contact lens case once a month.