Does the job,
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This review is from: 26 PACK Replacement Earphone Black Earpads for Sennheiser MX Model Earbuds - Will Fit Most Headphone Foam Ear Pad Cushion Covers From Gadget Zoo (Electronics)
These small black foam buds arrived 2 days after my order and fit my iPhone headphones perfectly. They were also cheap, including free P&P. So overall this was exactly what I wanted. I'm sure there are better buds out there somewhere but this is more than sufficient for most people.