Interlocking sections so it is easy to configure custom lengths. Maintains conductivity automatically (up to 5 sections - 15 feet). Premium rubber material featuring anti-fatigue air cell molded structure which enhances worker productivity, and resists damage from heat and common solvents - easy to clean and maintain. Premium nitrile butadiene homogenous rubber with no clay or silica fillers which means superior durability and electricals provides value, long life without discoloring and delamination. Durable industrial grade rubber, excellent value providing long-lasting, good-looking life; consistent electrical properties; will never delaminate. Excellent choice in soldering and other challenging manufacturing environments. Minimal shrinkage and curling. Ground cord is not included. Made in America.