Eachine EV200D - Detachable Patch; Replaceable Sponge

Detachable Patch
Snap joint assemblies allows easy replacement and maintenance.
Replaceable sponge
Patch 
Velcro 
Sponge 
Flannel 
Using Velcro as a bridge, sponge and flannel can be easily replaced,
and Velcro can be used for a long time.
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