Bergstrom Style Skeletal Muscle Biopsy Needle 4.5mm x 100mm 7 Standard Wire Gauge x 4" Fully Autoclavable / Reusable Stainless 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)