The NecksGen tethers are made from high quality fire resistant Kevlar webbing and stainless steel buckles. If you are in an incident that causes any stress to your device, it is recommended that you replace your tether as a precautionary measure. Please select the size you need for your device from the drop-down menu. Selecting a different length tether than your device originally came with is not advised unless absolutely necessary for those with specific needs. Never exceed 4″ of total tether slack in normal driving position.