Labcon Eclipse Pre-siliconized pipet tips for use with viscous samples. These tips offer very low surface tension. Every lot is lab tested and certified free of detectable Nuclease (Rnase/Dnase), Endotoxin (pyrogen) contamination and certified to U.S.P. results. Resins are pre-tested for metal contamination. All our Eclipse 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 won't 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 Eclipse tips in resealable zip style bags, in Eclipse refills, and in racks that have been sterilized using irradiation.