Carbon-filled, injection-molded polypropylene copolymer construction provides permanent conductive and shielding protection. LEWISBins+ Conductive Divider Boxes provides a Faraday cage when covered. Unaffected by humidity or solvents. Feature a surface resistivity of 10(5) ohms per square maximum per ASTM-D257. Fast decay rate of >0.10 seconds at 5KV applied charge. Stackable. Snap-on lids also available. Order in divider boxes in quantities specified, priced each. Made in USA.