Schmidt 5888 Ceramic Rollerball Metal Tube Refill Medium Point 0.7mm, Blue, 2 Pack Blister (SC58105) Safety Ceramic Rolling ball Refill with metal tube. Stainless steel tip with 0.7 mm, medium point ceramic ball. The safety technology features extended shelf-life characteristics. Suited for use in pens without cap sealing. 2 Piece Pack.