Specifications: Oil based + gel = emulsion Oil-based, heavy duty ink and gel light writing Writes with light force, strong and dense Product Size: Shaft Diameter 0.4 x Total Length 5.5 inches (11.0 x 140.0 mm); Weight: 0.3 oz (9.7 g); Retractable; Rubber Grip; Refill: EQ-0.5