Attention: after I had submitted this review, I received an email from the manufacturer, I should delete them immediately, they would then leave me free to send a new shell. I said this, that I like the new shell austeste, and if it is of better quality, I like to abändere the review. Then I got more mails whose content I better not give here. The matter went to Amazon. Therefore, be careful: the many good reviews can have their ground. I have paid much more for the rest more than € 9.99 for the envelope.