What is the advantages of the Fabric strap?
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Fabric strap can be used as earloop or as headstrap (some children ear to soft and difficult to hold the earloop strap).
Rubber strap
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I have bought a totobobo mask a few year ago. However recently the rubber holding the mask and the filter has disintegrated. Is there any way to get the rubber. Please advise.
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For an emergency, you can cut the earloop strap from a surgical mask as a replacement.
See fig. https://drive.google.com/open?id=163wJCnLHdKMAvszN-u1O8gEuf_u0LYoQ
You can also order the new fabric strap, which can be configured as head strap or earloop.