Maximum compatible headphones dimensions (case inside): 8.5 x 7.5 x 4.7 inches (22 x 19.5 x 13.5 cm). Compatible with many wired / wireless headphones. Engineered ultra-hard shell protects against drops, impacts or crushes. Soft inner maximize headphones protective in the case. Internal mesh pocket conveniently stores cables, chargers, AMP, earpads, adapters, iPod and other accessories. Compatible with AKG M220, K618, K612Pro, K603, K601, K553, K551, K550, K545, K540, K533Pro, K514MII, K514, K512, K511, K340, K272, K271MII, K271, K242, K240Studio, K240MKII, K240, K182, K181DJ, K171MKII, K167DJ, K142, K141MKII, K141, K121Studio, K121, HSD271, HSC271, AV100 case. If the case doesn't fit or break within one year, Geekria will replace or refund. No question asked.