Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Does anyone know the size specification of these and/or that of the factory Grado cushions? 65mm? 70mm?
Document: Anyone who has Grados know they aren't the most comfortable cans out there. These replacement cushions really helped, they are much softer.
Purchased for my GS-80s. Perfect fit, good quality and they look/feel like my factory Grado cushions. The only reason I didn't give them a 5 is because they're Exactly like my Grados. I was hoping for something softer and more comfortable in an aftermarket pad.
These ear cushions are so much better than the original, ear pads, from Grado. They were much softer and I was able to listen to my music for 5 hours with no fatigue.
Softer/smoother than the original foam. Fits just fine on Grado SR80 'phones. Not scratchy like the old cushions, so allows for longer wearing comfort. A good choice.
These cushions are perfect replacements for 225s. I've had my Grados for over 10 years now and these cushions let me continue to enjoy their nice audio fidelity at about half the price of the ones offered by Grado. I hope these will last a couple years.
Grado sells their L-Cush for 20 + shipping but these are just as good. Personally found them more comfortable than the G-Cush Bowls on my SR80i. These cushions are great for the 60 or 80 since they are like the cushions that originally shipped with them before the i-models were replaced with the S-cush flat pads.
I don't understand why I couldn't find any review about this L cushions. They are almost the same with original Grado cushions. I couldn't find any noticeable difference with the original one. They are not like a cheap cushion. Maybe instead of L cushion you may get a g cushion. I think they are more comfortable.
The sonic signature of these headphones is pretty neutral, with maybe a bit of tendency towards brightness and extended highs relative to low bass, but that is part of the nature of open-backed headphones in general.At half the price of the Grado L-cushions, these are a great buy and a great upgrade for Grado SR-80i users.
I have had my Grado SR 80i headphones for a few years. I use them primarily at the gym, and each day I go they end up sweaty and the cushions wet... finally it was time to replace my decaying old cushions. I saw these, which are not the type that came with my Grados. Mine had regular flat cushions without a hole in the middle.
I bought the Ear Zonk L Cushions for my Grado SR80i headphone. After a few weeks of listening I can recommend these replacement cushions to everyone who owns a Grado headphone. They fit well and the sound is very nice and open. I personally prefer these above the S cushions which came with the headphone, but that's maybe personal taste.
Answer: The outside diameter is 80mm, headphone side inner diameter is 50mm, ear side inner diameter is 40mm and the sponges are 20mm thick.