ER-15 ear-plugs... moulded to your ears... think bright green play-do in a huge syringe, bit of string in the middle, squirt it in your ear. Pull it out and be startled how long your ear-canal is... I love em, but you need this jelly stuff to make sure they fit ok. It ended up in my hair, on my suit, on the strings, the 1st gig but Im used to them now. £160 though...