Sennheiser IE 100 Pro Dynamic In-Ear Monitoring Headphones, Clear Parts 5" H - Overall Height

5" H - Overall Height - Top to Bottom: -12

Evans GMAD 22 Clear Bass Drum Batter Head

If you are looking for drastic effects (like telephone sounds) then get the normal version

which would practically shorten the vibrating element

Sennheiser IE 100 Pro Dynamic In-Ear Monitoring Headphones, Clear Parts 5" H - Overall HeightPrecise monitoring sound for live stages, mixing, producing or simply on the road Dynamic in ear monitors for confident monitoring even on the loudest stages. Consistent frequency response in both low and high SPLs. High wearing comfort, even for hours, thanks to an ultra flat design. With a stage proof, robust construction. Dynamic drivers of the next generation Whereas most in ear systems use multi driver solutions derived from hearing aids, the IE