CHO-STRAP® grounding straps are flexible, double-insulated laminates of copper (inside) and polyester film (outside), with punched and tinned ends to facilitate termination. They provide low-impedance ground paths at RF frequencies, thereby reducing radiated EMI problems caused by ordinary wire grounds. - Parker Chomerics Cho-Strap® Insulated Ground Strap. These ground straps are recommended wherever board-to-chassis or chassis-to cabinet grounding is required. They are generally more cost-effective than braided ground straps.