The Zebra pen is one of the nicest pens we have found. It writes beautifully. The ink dries quickly and is perminant. It is the only one we have found that can write on smooth book pages, acetate and tracing paper with great results and no smearing. The Zebra Pen is the one we use with Pen and Ink techniques. It is the only one we have found that we can varnish. There are two tips, one thick and one thin for greater versitility. It is a great pen for tracing patterns and making notes. Both ends write in black ink.