A telecommunications assembly includes a chassis and a plurality of fiber optic splitter modules mounted within the chassis. The heat exchanger comprises a first heat exchanging chamber, a second heat exchanging chamber and an array of heat pipes which are arranged to extend between the first and second heat exchanging chambers. The invention also relates to planar multibit magnetic tags suitable for use with such apparatus. The stent may be coated with such polymer or may be wholly formed therefrom. The multilayered polymer film may be used to form, for example, a reflective polarizer or a mirror. This lip sealing methods are the very effective and the most economical methods in preventing snore and preventing mouth drying while sleeping.