The mini stapler with a built-in un-stapler is made of impact-resistant plastic with a high-quality steel mechanism. It holds up to 50 staples No. 24/6 and up to 60 staples No. 26/6. It staples up to 20 sheets. Paper insertion... depth up to 25 mm. The mechanism comes with a 2-year warranty with the use of ErichKrause staples