Isotune's extra earplugs can be used for the Free model, and can be used if you lose them or if they break.
Foam plugs are made of soft memory foam that molds perfectly to your ear canals. We recommend changing earplugs every 1-3 months depending on frequency of use.
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BrandISOTunes
Description
Available in 3 sizes, choose between size Medium (yellow) and Large (red). Size Small (white) has been discontinued and instead you can choose the item IST-IT50