24MM. 100 plastic rounds (random color), multi-colored binding rounds, for adding extra pages, notes or illustrations. Lightweight Material: Made of high quality plastic, they are lightweight, easy to store and reuse, resistant to pressure and abrasion. Ease of use: These laptops with disc are easy to install and can be disassembled at will. Ease of use: these disc laptops are easy to install and can be disassembled at will. Variety of applications: you can sort and manage the different contents stored on these discs, the different colors representing the different types of documents, or add business card pockets, photo pockets, document pockets, etc. Package contents: 100 mini plastic discs in different colors, enough to meet your needs at work, study or daily life.