The undisputed pinnacle of pens: Montblanc ballpoint pen StarWalker Resin M25610BP Black rubber (clear dome cap) Twist ballpoint pen Created to signify the creation of a future beyond the Meisterstück, a new standard series: StarWalker Metal rubber is a rare model with solid brass coated with rubber. Engraved on the back of the clip: Germany metal Pix, and a serial number BW~ on the clip ring cover. It is believed to be a product from around 2013. The refill is M, so it has a mild writing feel. It currently writes, but the remaining amount is unknown. The second-generation twist mechanism is highly durable and recommended. Grease has been applied. The twist action is also very smooth. Silicone grease has been applied to each screw part. Minor scratches are visible, and rubber degradation is seen on the grip. For product care, do not use water (to prevent rubber hydrolysis), and wipe lightly with an alcohol-based disinfectant wipe. To replace the refill on this StarWalker, the single ring in the middle unscrews. The product itself is meant to last a lifetime, so please pick one up and try it. You'll only truly understand "Ah, this is a Montblanc" after using it.