[Jet Stream] Addictive smooth writing taste/Equipped with ultra-low friction Jet Stream ink! [Mechanism] Knock type [Ink color] Black, red, blue [Ball diameter] 0.5mm [Specifications] Shaft: PC resin with rubber grip, clip: PC resin [Size] Shaft diameter Φ12.2 x 15.9 x 143.7mm, weight 11.5g [Quantity] 10 pieces [Refill] SXR-80 various types