Labcon Eclipse pipet tips include as standard many features available from other suppliers only as special upgrades. All the Eclipse tips we make are made of high quality 100% pure virgin medical grade polypropylene so you won't find recycled plastics in our tips. We pre-test the resin to ensure no extractables are present. 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 refills for our Pagoda system, in Eclipse refills, and in racks that have been sterilized using irradiation.