Disposable otoscope specula that work well with not only our new 4th Generation Otoscope as well as all our RA Bock models. Actually it will fit most professional otoscopes on the market including Welch Allyn with the exception of the Welch Allyn MACROVIEW Otoscope. These are very high quality and fit our new 4th Generation Dr Mom Otoscope perfectly as well as all our RA Bock models.