CMD2877379 ESD Grounding Wrist Strap & Cord Set. ESD wrist-straps feature premium grade fabric band with an elastic ratio of 1:2.5” to 1:3. The outer surface of the wristband is non-conductive and the inside surface of the strap is conductive lined with 5 rows of double-ply silver yarn. The wristband also contains an easy adjustable clip that can tighten or loosen the fabric band to fit any wrist shape.