ElectronicsThe 111 with Battery Contacts BATTERY INSULATOR CLR 1000 PER ROLL is an electronic part manufactured by Keystone Electronics. It is designed as an insulation for use between a battery and its contact points. It is a polyester insulating material and comes as a roll of 1000 insulators. The material is crush and tear-resistant to ensure a secure, non-conductive surface. It is a UL-approved product, rated for 1,000 volts and is flame retardant.