Product Size (Approx.): [Body] Diameter 0.4 x Length 5.9 inches (11.1 x 150 mm); [Ball Diameter] 0.02 inches (0.5 mm) Color: [body] first light pink [ink] black Ink Type: Water-based gel ink Material: [Sheath] Resin, [Grip] Rubber Type: Clip slide knock type The FriXion Ball Knock Zone is a next-generation model of erasable ballpoint pen that writes darker and longer in response to the voice of users looking to increase ink capacity. Equipped with Ver. 2 (Version 2) refill, this metal refill uses a newly developed premium friction ink that can write dark and long in response to the voice of users looking to increase ink capacity. Premium FriXion Ink is enhanced by 30% in black and 15% in red and blue than traditional FriXion ink, so you can write dark and high visibility. Chip hold system: The tip is equipped with a newly developed tip holder. The special 3-way parts hold the tip firmly in place to reduce the rattling of the nib and help you concentrate with a steady writing experience. Noise-cutting knock: The internal parts have added spring to soften the impact of knocking, and it features a quiet knock sound. Compared to conventional products (*), we cut 78% of the sound when knocking (*Comparison with friction ball knock).