Words Metallic Navy Blue Ceramic Ball Pen - 0.5mm - Writing Color: Black [Size] Length 138.2 x Shaft Diameter 9.8 x Maximum Diameter 12.7mm [Weight] 14.8 g [Ball Diameter] 0.5mm [Materials] Shaft / Cap: Aluminum, Base: Brass, Grip: ABS resin, Ball: Ceramic [Replacement core] C-305 (Our oil replacement core: B-300 series, gel replacement core: G-300 series are compatible)