Jinhao Century Roller Ball Pen Fashion Style Blue Celluloid Silver Trim Jinhao has two type refills for their rollerball pens . One is push type while other is screw type . If your refill is push type ,you can purchase the jinhao or duke push type refills (ASIN :B0130LL8L0 ) . If you refill is screw type , it works with jinhao and montblanc screw type refill ( ASIN : B01LX1D6WI) Capped length 135mm Diameter 12.5mm , pen weight 40g Package :one pens as picture shown Cap : Screw Type