We bought 3 of these to use with Sennheiser K6 mics with the ME66 capsule and they were a perfect fit - quite tight, so it won't slide off. The foam is nice and dense and really helps to cut out unwanted noise. We have used them with the mics at a few outdoor gigs since, and they helped greatly in cutting down wind noise.
An excellent quality product, although I think a little expensive for what it is.
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