The S Series (S3, S5, S10, S20) is a high-quality line of drafting pencils from Pilot. Features are “improved” on the pencil as one moves up the S series. The S5 series feature a rubber ribbed grip (longer than usual to accommodate different hands), fixed sleeve, lead grade indicator and clip. Plastic barrels are colored to match the lead size of the pencil. The drafting pencil has a great shape, low center of gravity and attractive form and is a nice option in between the S3 and S10 lines. It will fulfill all your professional drafting pencil needs at a very economical price.