Who knows Sidolin, knows the quality plaster and is enthusiastic. I buy this Brillenputztücher to since I have to wear reading glasses. The cleaning cloths clean my glasses always as good as no other glasses cloth! Then the price / performance ratio has persuaded me, this at Amazon To order Brillenputztücher of Sidolin. It's worthwhile making Presivergleich and you know, where you have besetellen.