Our SuperSlik Low Retention tips have a proprietary modified polypropylene surface that limits the adhesion of cells, rDNA, proteins, and other viscous materials. Their accuracy and precision is up to 10 times better with viscous samples than standard non-wettable polypropylene. SuperSlik tips are made from our own proprietary resin formulation that uses no additives or coatings that migrate into your samples. Unlike low retention tips from many others, SuperSlik tips use no restricted chemicals and meet RoHS regulations. The resin helps increase the contact angle of fluids and lets you dispense the maximum amount of sticky DNA molecules. These tips were developed in our own laboratory and have been found to be ideal for viscous samples. Low retention tips are best suited for pipetting thick or sticky fluids and may not be appropriate for all uses. Like all our other tips SuperSlik tips in racks are packed in our trademark Teal racks. These racks are made of polypropylene and are autoclavable repeatedly. They have sturdy latch hinges that wont come apart like lesser quality tip racks and a special snap lock designed so that it will not catch on your gloves. You can also get SuperSlik tips in resealable zip style bags, in refills for our Pagoda system, in Eclipse refills, and in racks that have been sterilized using irradiation.