Hey there, yes, the headband is in fact leather.
The metal cups stay on pretty nicely, to be honest. If for some reason they come loose, they pop right back on and with a little tapping of the little metal bars on the holders will hold them nice and tight.
Honestly, the metal cups helped out a whole ton. HP-1 drivers were tuned with metal cups in mind, so putting them in the proper housing really helps with the signature. You'd think putting them in metal would make them brighter, but thanks to the liberators and flats it helps soften it and increase the soundstage. Both bowls and flats are really comfy on the liberators. I personally like the flats over the bowls for the added bass. The soundstage is still improved thanks to the larger cups and liberators.
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Grado SR225 w/ Liberators + Flats | Mylarone X3 | Mylarone X3i
Home: Laptop -> M-Audio Transit USB -> PA2V2 -> Grado SR225 + Liberators & TTVJ Flats
On the Go: Creative Zen M: Vision 30GB w/ LOD -> PA2V2 -> Mylarones X3
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