Summary: I thought that I had ordered the large ones but made a mistake and clicked medium. I sent them an email and they replied immediately and told me to send them back. They then sent me the size that I actually wanted without any quibbles at all, they also kept me informed all the way. As for the ear tips, they send a little box with plenty in plus a few spares that fit another set of sennheiser's that I own. They fit perfectly and cut out a lot of outside noise.
Summary: The box contained eight earbuds exactly as advertised. They had the blue backs and the horizontal cross pieces and were indistinguishable from those that came originally with my CX870s. Strangely the box also contained another six earbuds of varying shapes/designs/colours without the cross piece. I won't be trying these with the Sennheisers as there would be nothing to stop the diaphragm guard falling into your ear.
Summary: 8 Large Replacement Set Earbuds Eartips for Sennheiser CX Series: CX685 Sports, CX870, CX880, CX880i, CX980, CX980i, CX985 - OCX Series: OCX685i, OCX880 - CXC Series: CXC700 In-Ear Earphones I'd lost yet another ear bud for my Sennheiser CX 880 earphones so decided to go for a bulk order. These arrive this morning after only 3 working days! (They were posted in Chicago IL). They are absolutely ideal & the vendor also included a few freebies!
Summary: just recently bought this after previously bought MM55i which wasn't bad but hated the fact that one side of the cable was shorter and wasn't fit properly. This one I can confidently say fit excellent and like the my previous one has noise cancellation and I can wear it all day, I really love it and would recommend it for any body. I'm really glad that I opt for this cx880i.