Typically used for micro-dissection, tungsten micro-needles are made from high-quality tungsten metal. Select either sharp tip (less that 1 micron) or blunt tip (3 or 5 microns). All micro-needles offer lateral stability as well as minimal spring action during manipulation. Micro-needles are 50 mm (2 inches) in length, and come in a box of 10. Select either 125 or 250 micron shaft diameter.