Harbinger Big Grip No-Slip Lifting Strap is made from heavy duty nylon. Dura-Grip rubber provides added strength. The 21.5" Dura-Grip rubber strips grab the bar for a "no-slip" grip when lifting. Extended length allows you to wrap the bar several times. Merrowed end tabs help prevent fraying. When using the strap, the rubber strip side must always face the bar.