Product Information: 33Pcs black plastic expander, including 1.9x0.55cm/2.35x0.55cm/2.75x0.45cm sizes, 11pcs/size.
Material: These discs binding expander are high quality ABS plastic with a smooth, burr-free surface, they won't scratch or snag when turning pages.
Easy to Use: The disc binding rings can be flexibly arranged for simple removal and changing of notebook pages without damaging the paper, perfect for students and teachers.
Application:: These plastic expansion discs are suitable for most junior, intermediate or letter size notebooks.
Practical Gift: These discbound expansion discs can be easily added, deleted and replace, it is a great gift for your friends, colleague, classmates.