Double cannula

Available fours cannulas series. Series I: Recommended for rat or mouse use, 0.48mm (outer diameter) x 0.34mm (internal diameter). Series II: Recommended for rat use, 0.64mm (outer diameter) x 0.45mm (internal diameter). Series III: Specifically for mouse use, 0.48mm (outer diameter) x 0.34mm (internal diameter). The height of cylindrical plastic pedestal of Guide cannula is different from Series I. Series IV: 0.41mm (outer diameter) x 0.25mm (internal diameter).