The Precision Press Pen is designed to be "the ultimate clicky pen". It is entirely modular with each component being easily replaceable and built to last a lifetime. The standard pen utilizes an all metal body machined out of 6061-T6 Aluminum. To ensure proper balance and amazing strength the tip is machined out of 303 Stainless Steel. A clip, pressed out of spring steel and coated for durability and corrosion resistance, helps keep the pen securely fastened and close at hand. The pen also uses an adjustable spacer for allowing fitment of multiple cartridges (Fisher / Foray / Parker and many more) while at its heart, resides our now famous 416SS machined advancing mechanism with a two piece bearing-cam design for silky smooth operation (so smooth, it doesn’t even "click"). Finally for grip and comfort, the pen body has removable contrasting black Buna-70 o-rings which assist in maintaining a positive grip on the pen when you need it most.