Auto Ballpoint Pen Refill, Water-Based, 0.03 inch (0.7 mm), Box of 5 C-307P Black / 5P

• Auto Ballpoint Pen Refill, Water-based (Ceramic Ball)
• Size: Total length 4.4 inches (111.5 mm) x shaft diameter 0.2 inches (6.2 mm); Weight: 0.2 oz (5.3 g)
• Ball Diameter: 0.3 inches (07 mm); Material: Brass
• Country of Origin: Japan
• Quantity: 5 pieces

Rollerball pen refills pack of 5 Medium point, water based ink with a ball diameter of 0.03 inches (0.7 mm). The ball of the nib is made of ceramic for a smooth writing experience. Equipped with a special structure that makes it difficult to dry up even when the cap is open. ● Comparison between ceramic ball and metal ball (ceramic features): 1. Ink glue is very good (smooth and slurdy) 2. Rust free for excellent storage stability (chemical stability) 3. It is said to be second to diamond with excellent abrasion resistance (it is hard to deform, smooth and rotated).