Manufactured from virgin polypropylene. Tips feature a blunt, square-cut orifice for rapid aspirating and dispensing of fluids. Ultrafine point tips have a thinner, flexible wall to help dispense the last bit of sample from the tip. Low-binding tips feature a proprietary modified polypropylene resin that limits the adhesion of cells, rDNA, and other viscous materials. All tips are free of trace metals, DNase, and RNase. Low binding tips are also protease- and human DNA-free. Sterile tips are endotoxin-free. Tips and hinged racks are fully autoclavable to 122°C (252°F).