Mini PAP Pen The Mini PAP pen draws a water repellent circle around slide mounted tissue, preventing the waste of valuable reagents by keeping the liquid pooled in a single droplet. The Mini PAP Pen is especially useful when working with multiple sections on a single slide because its tip is smaller than the PAP pen. Each pen can be used to draw about 400 circles. Product Size: 1 pen Accessory Type: PAP Pens Shipping Condition: Room Temperature Regulatory Statement: For Research Use Only. Not for use in diagnostic procedures. Store at room temperature.