Axygen® Gel Loading Tips are designed to fit a wide variety of single and multi-channel pipettors, compatible with most popular brand of pipettors. These polypropylene tips are nonpyrogenic and RNase-/DNase-free. Available in either flat or round versions, with different outer diameters for different gel thickness. Axygen® Gel Loading Tips are designed to fit a wide variety of single and multi-channel pipettors, compatible with most popular brand of pipettors. These polypropylene tips are nonpyrogenic and RNase-/DNase-free. Available in either flat or round versions, with different outer diameters for different gel thickness.