Giriraj Foils Pvt. Ltd. Manufactures High Refractive Index [HRI] Films. Giriraj Foils Pvt. Ltd. Is an ISO 9001:2000 DNY certified company. The company manufactures a broad range of specialty coated films and foils for holograms. The High Refractive Index [HRI] Films are semi transparent and it enhances the reflection capability and iridescence.