Mini Size: The outer size of the small photo album is 6.5 x 6 cm, which is very portable and can be carried with you.The internal size is 5.7 cm x 4.7 cm, which is suitable for storing 2-inch photos. Waterproof PU Material: The cover of our photocard binder is made of high-quality PU leather. The mirror cover is waterproof and dust-proof, which can protect the interior well. The sturdy interior is durable and practical, preventing the photos from getting damp and aging. Key Ring Buckle Design: The picture keyrings comes with a metal key ring buckle design, which can be used with a key or hung on a backpack to become a fashion accessory. DIY Blank Keychain: You can create your personalized keyring, inserts photos into the blank keychain, such as your friends, family, pets, or your favorite photos, create a unique and special clear keychain. Wide Application: The photocard holder keychain is great for storing photos, picture cards, credit cards, name cards, pet hang tags, gift tags, keychains, and souvenirs.