Our standard cannula outer diameter is 1.2 mm, sized to fit our cannula holders. For custom applications, many users employ glass cannulae having an outer diameter of 1 mm. We are happy to make cannula packs for you to suit your custom application. Our custom 1 mm OD cannula packs include one dozen finely made cannulae, sized to your specifications. The closely matched pulled tips featured in our custom packs are also well suited to studies involving intraluminal flow. Just let us know what size vessels you will be working with, and we would be happy to make cannulae to your specifications. We can also make the cannulae longer (up to 70 mm) than our standard 30-40 mm length if you wish.