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The Mystery Filler features a unique mechanism with 7 high-precision moving parts, modeled after watch mechanisms. With a press of a button, the mechanisms are activated, allowing you to fill your pen by twisting the piston. When it\’s full, simply press the button again to render the mechanisms immobile. The Mystery Filler utilizes Pineider\’s twist-lock magnetic cap with a marine steel goose quill clip. Limited to 888 pieces worldwide, the Mystery Filler sports Pineider\’s 14K gold flexible quill nib and arrives in the standard Pineider green \”writing desk\” box with a Pineider Pen Filler for on-the-go refills. NibMaterial:14K Gold, Rhodium Plated Filling Mechanism:Piston