The SCS 9900 Conductive ESD Rubber Floor Mat, Black, Anti-Fatigue, 0.600 in. X 3 ft. X 5 ft. enables workers to stand comfortably for long periods while minimizing the fatigue associated with standing work. Consists of a matrix of hollow cylinders that function like a spring when compressed. This models a durable cushion that is designed to offer secure, stable footing and an energizing responsiveness. Their structure provides a stable surface supported by rubber cells that soften in response to surface activity. These cells provide some of the most effective cushioning solutions because the 9900 gets softer as compressed, not harder like products made of foam. The resistance range of the surface layer remains low enough to act as path to ground with normal buildup of dirt and grime on the mat, and allows the mats to remove electrostatic charges when they are grounded.