Quantity: 48 pieces Outer diameter: Approximately 3cm Inner diameter: Approximately 2.5cm Height: Approximately 3.5cm Thank you for viewing. These were used as cores for materials, so there may be some scratches or peeling. (See photos) How about using them for crafts, science projects, or school festivals? They are very durable. Other sizes are also available. Mixing sizes is also possible, so please feel free to inquire.