Pull-out ear plugs with cord. Made of foam plastic.
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Sufficient sound attenuation. . The "metal hook" to be attached to the main layer is a little too hard to open. moreover, the part that will sit against the string too wide, which causes the buckle to easily fall off (I've lost two) As you can see in the picture, the left hook hangs in "the big loop instead of being adapted to the small loop that This makes the hook easily detach from the string when handling.