These high quality, low retention, non-filtered tips are specially designed with highly visible reference marks and they are Certified RNase, DNase, and Pyrogen and Human DNA Free. They are made right here in the USA and are non-filtered and non-sterile. These tips are environmentally friendly, made from 100% recycled plastic and recyclable as well. No transfer device is needed to load the tips. They come in sturdy, reusable racks that can withstand multiple autoclave cycles and are great for single and multi-channel pipetting. The fine point design and high clarity make them the top choice in today’s highly specialized market.