The Micronic Eco-Friendly Choice Refill Rack consists of a reusable base rack and cover, and a refill system made from 99% in-house renewed materials. The refill rack is available in a 96-well format for 1.40ml tubes and is compatible with both internally and externally threaded tubes, using screw or push caps. Both the base rack and cover are made of polypropylene (PP), making the entire product easier to recycle. The EFC Refill Rack reduces ecological costs and carbon footprint and is certified with an ACT label .