Schmidt 888 Ceramic Rollerball Plastic Tube Refill Fine Point 0.6mm, Blue, 2 Pack Blister (SC58109) Safety Ceramic Rolling ball Refill with plastic tube. Stainless steel tip with 0.6 mm, fine point ceramic ball. The safety technology features extended shelf-life characteristics. Suited for use in pens without cap sealing. 2 Piece Pack.