I have just received all this clap. It perfectly matches my expectations. Ergonomics are good, its main purpose: the clap is heard very well. He is tall, stiff, strong, NICE, and in good condition ... To write it you must use a chalk. But I criticize the price. No transport (because it comes from Germany) but the price of clap: 16. (too expensive!). I recommend it for people who have professional use :).