Precision moulded HIP Ceiling Rings with acoustically designed dispersion ribs for wide coverage. Ideally suited for offices, restaurants, homes etc. Fitted with a unique spring locking system that is easy for installation and removal with no damage to the false ceiling. Available in three sizes , 4 inch ceiling rings for installation in small offices, 5 ½ inch ceiling speakers for small and medium size spaces and 7 inch ceiling rings for installation in large areas. Optional line matching transformers available, for installation in case of multiple speakers. All the drivers used are of Hi-Fi quality .