Usage Tips:Features: Colourful keyrings not only effectively protect your key from wear and materials safety, but also prevent keyrings from scratching other items. You can easily put on and take off the key marking as they stretchy, and the key caps can protect your key wide application this key marker is suitable for a variety of applications, it canbe used for house key, office key, car key, luggage key and more. The key marker is crafted of silicone, flexible and durability, small and lightweight, waterproof, suitable for long terms use. Quick identification: The coloured key identification is easy to put on and take off, elastic and soft to better protect the key head. This multiple coloured keycaps can also be used to classify key such as labels to distinguish between different requirements or functions for faster key identification. Specifications: Component:Silicone Round Size:Approx.24x24mm/9.44x9.44inch Square Size:Approx.28x25mm/11.02x9.84inch Quantity:20pcs/40pcs Package Includes: 1 Set Silicone Key Caps note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.