It looks like a book,so we call it a sample book. Just the same size as an ordinary book. Small put everything in place. It saves space and is easy to carry. Clear label on the front and on the back of paper taping, never mixed up. When components are used up, the book itself could still be reused for your other components. Beginner hobbyists and electronics experts alike will appreciate the and organization of components included with this kit. Resistor book: 0402 : plastic colour: black Package Contents: 1 x Capacitance Sample Book Kit (8500pcs) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.