The delta markers are highly recommended really great and for the price. I have worked in school and work with more expensive products, but then decided to go because of the price of these markers and have to say that I am pleasantly surprised! Problems with stripes or by pressing so I can not determine or know this occurred partly from higher-priced Copic markers when choosing the wrong paper, etc. But with me is neither anyway. For me, the delta markers are a great alternative to markers from other manufacturers, where you often unfortunately own only pays for the name a lot more. Great ink coverage, great bright colors and a great price. Five stars are there really enough. I'm really excited and going to buy there again marker this company.