70% less plastic - MµltiGuard HB Advance™ Sterile HybridRack GREEN System Features µLowBind™ Barrier Filter Tips in Recyclable Paperboard Racks (HybridRacks). Only the insert is made from plastic. Made fromrecyclable #5 polypropylene. Hybrid Racks are Sterile and Ready-to use. No refilling racks. No Autoclaving for sterility is necessary.