I have 5 of these and they won't fit these headphones from my collection: Beyerdynamic T1, T5P, T90 Jubilee, Sennheiser H800, Philips X1, and AKG Q701, and K550. Barely fit: B&W P7. Fit okay: Sennheiser Momentums, Harman Kardon BT, V-Moda LP, and Sony PS4 HPs. Keep that in mind. They won't fit full sized headphones. I have Woo Audio HPS for them.