Simply because it's a super good, quality product is just that good does its work - unlike the many cheap, bad parts, which can be bought for little money - and after a short time the conk. Because with us kurzsichtigerweise listed in the company only Low to office supplies and so is available, I have gained me privately this punch for the office and am just very pleased. Looks super from - and is just a great, valent part - the price / performance ratio is absolutely right. Conclusion: Highly recommended. Cheap is not always good! Rather just spend a little more money and benefit for years.