Certified RNase, DNase, DNA and Pyrogen-Free. Tips are fully autoclavable - Sterile formats are Gamma Irradiated. All products made with colorants are guaranteed to be heavy metals-free. All molds are diamond-polished to a glass-like finish ensuring optimum performance. Manufactured from virgin, medical-grade FDA-approved, bovine-free plastic resins in medically-clean facility. Bulk Formats: Packaged in resealable Zip-Lock« bags. Low-Retention Formats: Minimal sample retention and maximum sample recovery.