Unitron domes are available in Closed, Open and Power options in sizes Large, Medium and Small. These domes are smokey grey in colour helping to lengthen the life of the dome. Please take care when ordering that you know what size and type of dome you require. If in doubt please ask or alternatively seek advice from the company that supplied your hearing aids. If you order the wrong size / type of dome we are happy to replace with the correct item if the product is returned unopened and in a re-saleable condition. However, we cannot accept opened packets.