Okay, I am not a professional draftsman, but a noticeable difference can be determined for me with these pins. Before I came to these pins, I have drawn with normal or low pencils. After 3-4 drawings a cheap pencil was heruntergespitzt already a small stub, because I had nachspitzen repeatedly. These pencils but I had to while drawing more than 1 times pointed (I use a Faber-Castell Spitzer), and thereby turn the pencil only 1 time - and the air was sharp again. The pins will probably keep me very long. One can also buy them individually, as I also draw with B8 For example, strength is not Registered. For me it was also the first time with different strengths to pencil drawing. To try out you have covered here many strengths to try out. Also the feeling while drawing the faces are very high quality! I'll never draw with the normal cheap pencils! And even if it is beside the point, the shell and the pencils looks very nice and you can see that it is there to no school pencils but quality crayons! If someone even better than those pencils knows please tell :)!