Square CableCap Insulators Pair Red/Black. Square CableCap insulators - Cable size 1/0. Pair: 1 Red/1 BlackWARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.