The Ear Gear Mini Square is designed to fit hearing instruments up to 1.25 inches in length and has a larger opening on top. Some of the models the Mini Square fit are: Sonic Innovations Ion, Sebotek Pac, Micro-Tech Seneca Plus and many more. The Ear Gear Mini Curved is designed to fit hearing instruments up to 1.25 inches in length. Some of the models the Mini Curved fit are: Hansatone Leonardo 2, Phonak Savia Micro, Oticon Delta, Siemens Centra, Cielo Vi, GN Resound Metrix, Unitron Moda, Audina Sparo, Vivatone Entre Mini, Widex Inteo Elan, Senso Diva Elan, Rexton Calibra Free, Magnatone Shadow, Spectrum BelAir, Bernafon Swiss, Starkey Aspet Xtra, Belton Edge and many more. The Ear Gear Mini Triangle is designed to fit hearing instruments up to 1 inch in length. The Mini Triangle fits the smallest of hearing instrumnets such as the Oticon Delta, GN Resound Dot and many more. Protection from dirt, sweat, moisture and loss Designed to fit the new, smaller open fir hearing instruments 3 styles - square, triangle & curved - to fit the most popular shapes of open fit hearing instruments ALL 3 styles are available with or without cord and in monaural or binaural models Available in a variety of fun colors including camouflage, gray, beige, red/orange, black, royal blue, pink/purple and chocolate brown