Bought these as a replacement for the original earpads for my Fostex T-X0 headphones after the leather started to flake.
Comfortable fit and lambskin feels like it will be comfortable and hard wearing. Just a tad smaller than the OEM pads but I was able to fit them easily enough. Sound character is a little different than the OEM "hybrid" style pads but they seal well and have a similar overall fit.
I would recommend these for anyone looking for a replacement for the T-X0 or any similar T50RP form factor headphones.