Compatible: These replacement ear cushions are compatible with Boat Rockers 510 headphones. Material: Boat Rockerz 510 cushion pads made of PU leather on the outside & soft foam on the inside. Replacement: Ideal for replacing broken, worn out, or lost earpads and for giving your headphones a new look and feel. Easy To Install: Pull out the old earpads. Slip & tuck the edges of the new Boat headphones 510 ear cushion into the headphone groove. Stretch if necessary. Comfortable: Boat Rockerz 510 ear cushions are made of soft foam that are highly elastic & flexible, making them more comfortable.