8.5cm Trocar for Rodent Surgery - 14 Gauge, with a Tapered Tip and Stylet. Subcutaneous tunneling needles (trocars) offer a quick and easy method for routing catheters and electrodes under the skin. SAI's TRO-14MS is manufactured from thick-walled medical-grade stainless steel, has a tapered tip and stylet, and is ideal for mouse surgery. Customized tips and lengths are available, please contact us for more information. 14G, 8.5cm. Product is for laboratory animal research only.