Mack pinstriping brushes are imported from Mack themselves in the US and are extremely popular within the pinstriping community. This brushes consist of mainly sword liners in slightly different shapes and widths and predominantly made from squirrel hair. Blue squirrel is the most readily available and comes in long lengths, as well as short lengths. It is generally used for striping brushes and lettering brushes. Brown, or kazan, is no longer as plentiful as it was several years ago. It is generally found in the shorter lengths and used for stripers, quills, and outliners. Both blue and kazan are very soft and fine. They point as well as kolinsky, but have very little snap, since the hair is not very resilient. Grey squirrel is the hardest to find and the most expensive. It is more durable, has more snap and makes a great quill or lettering brush.