It took me 20 minutes to take out the old one and put in the new one. Youtube videos are handy to learn how to take out the old ones and put in the new ones. The product quality is good and after this replacement, my headphone is looking just like a brand new one. Unmatched Comfort: These replacement ear pads are made from a new softer PU leather & memory foam that find the perfect balance of comfort and durability. No need to break these ear pads in, they feel soft from Day 1. One of the foam covers split on the original set. Bought these as a replacement. Replacements are just as soft and comfy as the original parts. Construction of them looks to be a bit better. Old set split along the seam where the cover material was molded. Seam on the replacements looks like it's been redesigned and is better. Rugged Durability: The inside seams on this replacement ear cushion kit for Bose QC35 are made with stitching that is reinforced with glue, which prevents your cushions from splitting and increases their lifespan.