All racked sterile tips are shrink wrapped and certified free of RNase, DNase, ATP, pyrogen, bioburden, PCR inhibitors and endotoxin and DNA All nonsterile racked and bulk nonfiltered tips are certified free of RNase, DNase, and DNA.http://www.fishersci.com/ecomm/servlet/fsproductdetail?storeId=10652&productId=620691&catalogId=29104&matchedCatNo=02707400&fromSearch=1&searchKey=400||707||02&highlightProductsItemsFlag=Y&endecaSearchQuery=%23store%3DScientific%23nav%3D0%23rpp%3D25%23offSet%3D0%23keyWord%3D02-707-400%2B%23searchType%3DPROD%23SWKeyList%3D%5B%5D&xrefPartType=From&savings=0.0&xrefEvent=1431549264529_0&searchType=PROD&hasPromo=0#sthash.cTa1DVvO.dpuf