Shure SE535 Manual De Instrucciones página 9

Choosing a Sleeve
Select an earphone sleeve that provides the best fit and sound isolation. It
should be easy to insert, fit comfortably, and easy to remove.
Soft Flex Sleeves: In small, medium, and large sizes. Made from pli-
able rubber.
Soft Foam Sleeves: Compress the foam sleeve between your fingers
and insert into the ear canal. Hold in place for about ten seconds while
the foam expands.
Triple-Flange Sleeves: If desired, use scissors to trim the stem
on the sleeve.