Pros: Seemingly good build quality
Cons: Not a great sound
Cheap, cheerful sport 'buds on clips'. They're a huge improvement over the older MDR-J10 which don't come off when pulled, so these rubber clips allow the buds to be pulled off (by accident) which saves the cable from breaking too easily when snagged.
No real improvement on sound quality over the older design which is quite muddy like most buds, but other than that, it's difficult to knock them.