Specifications: A addictive and smooth writing experience. Refill for Jetstream rollerball pens. SXR-200-07 Product Size: Shaft Diameter φ0.09 x Total Length 2.6 inches (2.3 x 67.0 mm); Product Weight: 0.04 oz (1.0 g); Ink Color: Black; Body: SXE3-3000-07; MSXE4-5000-07; Art Material Shop Dot Com Postcard A; Limited Product! 1 x Cute Animal Postcard