Bergstrom Style Skeletal Muscle Biopsy Needle 3mm x 100mm 11 Standard Wire Gauge x 4" Fully Autoclavable / ReusableStainless Steel Outer Cannula: Printed tip and fenestrated shaft Inner Cannula: Cutting tip and female luer fitting for optional suction Blunt Trocar: For removal of biopsy sample Sealing Cap: For sealing inner cannual (optional use)