The 20 mL LTS tips are compatible with Rainin pipettes with LTS LiteTouch. This product is packaged in re-sealable zip-lock bag, which is the most economical way to go. The tips are cleaner than sterile. These are proven to be BioClean as they are 100% free of DNA, DNAse, RNAse, ATP, Pyrogens, PCR inhibitors, additives and bioactive contaminants. The tips do not have any deformation, crack, or flashes. It is sold in a pack of 100.