These three are the same design, just different lengths or widths. They are not a friction folder but not quite a slip-joint either. They do not lock. The Standard Sharpy is the same size as a Sharpie marker/pen and has Nylatron washers. The closed length is 5.5″, blade length is 3.6″, weighs from 1.5 – 1.6 oz. The Shortywas made for those needing a blade less than 3″ and ‘runs’ on Nylatron washers. It has a closed length of 4.75″, blade length 2.87″, weighs between 1.3 – 1.4 oz. The Chunky features bearings and is the same size as the Shorty except .10″ wider to accommodate the bearings.