Our cones are manufactured by JBC Safety Plastic. These cones are PVC injection molded, come in one piece design and are able to withstand challenges and adverse road conditions. They grip the road so they are not easily blown over. When hit, the base joint will stand up to abuse. The 36″ cones are used mostly on Md Transportation Authority Toll roads and by the Maryland Airport Authority. All cones meet NCHRP-350 & MUTCD criteria. They are certified on the Maryland QPL.