Rubber King Tyres India Pvt. Ltd. Manufactures Butyl Rubber Made Tubes. Rubber King Tyres India Pvt. Ltd. Is an ISO 9001:2000 certified company that offers Butyl Rubber Inner Tubes and Curing Air Bags and Curing Bladders. The Butyl Rubber Made Tubes of trade name `Rubber King` is used in various tyre industries. Butyl Rubber Made Tubes are designed to confirm to specifications laid down by BIS, ASRTU, Defence Authority, Canadian Standards and ITTAC Norms.