I got these for my soundmagic E10 headphones. The sound was good to start off with, but these make it fantastic. Very clear, very loud when turned up to max, and very little sound leakage. Try to work out what size you need beforehand and buy a multipack of the same size ones.
EDIT: 10 days after writing this review, I found my tips had worn out already. Talk about short lifespan! I was using them for 3-4 hours a day, taking them in an out quite a lot but keeping the headphones in a case when not in use. They are made out of the same sort of stuff as earplugs - a sort of waxy foam. As you use them, the waxiness rubs off and they stop fitting your ears so well. Be warned. When new, they have a great effect on the sound quality of your headphones, but they have a very short lifespan.