Comfort style is slightly larger than Slimline and more elegant. The pen uses a twist mechanism and a Cross compatible refill. The pencil uses .7mm lead. Comfort pens and pencils can be made with or without a rubber grip. The top pen is made from a Nitro R, the bottom is made from a VIP 300.
Nice straight barrel pen with a click mech. Pen uses a Parker style refill.
This beautiful pen shown above is made from a Tidalwave. It has Parker style refill and twist mechanism. The pencil uses a .7mm lead with a twist mechanism also.