Stirrer Blade, PTFE, Banana Shape, Solid, 10mm, for 5000mL Flasks, 45/50 minimum joint clearance. Blade is shaped to resemble the contour of a round bottom flask. Blades are solid. Made of 1/8" PTFE to fit 10mm OD stirrer shafts. Minimum joint size listed is the size required to allow passage of the blade.