They have two types of quality surface. "Standard" pure polypropylene surface; - internal
"Low binding" surface: the hydrophobic tip reduces surface tensions. Certified "Human DNA Free." This property offers two benefits: maximum restitution of the sample and a much lower retention of DNA and proteins than on an ordinary tip. Good Laboratory Practice (GLP, GMP) can manufacturer's website to download the certificates for each lot of product – Quality Assurance. Other variants of tips, visit the manufacturer's website: www.sorbio.com or: www.biologicals.cz/e-shop.
Also Low Retention Tips.