Sennheiser IS 150 Notice D'emploi page 18

Replacing the ear-cushions
The ear-cushions can easily be removed from the headphones and cleaned
with warm soapy water
should be replaced for reasons of hygiene. Replacement ear-cushions are
available with different degrees of softness:
Black ear-cushions, firmer version
Transparent ear-cushions, softer version
Please order your ear-cushions from your Sennheiser dealer.
18
. From time to time, however, the ear-cushions
Cat. no. 37080
Cat. no. 40949