What is the life span of these ear plugs? Are there replacements that can be bought? Or one just gets another pair after certain time?

Prob depends how you take care of and where you store when not using. I have had mine for over a year now and they still work great. Be sure to spend the time when form fitting them and you will be pleasantly surprised with how effective they are. Good luck!

Do these muffle out the sound of a gun shot while also allowing you to hear people talk??

They are crap, Not enough melty material to do good job filling ear cavity. Could never get them to seal in ear. Tossed them and considered the loss the price of education.

Package Dimensions	11.4 x 8 x 4.09 cm; 50 g
Color	グレー
Material Type	ポリカーボネート

Decibullz(デシブルズ) ブローニング聴覚保護 カスタム成形耳栓の撮影用 31デシベルノイズリダクション評価 (NRR) ストラップとトラベルケース付属

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Decibullz(デシブルズ) ブローニング聴覚保護カスタム成形耳栓の撮影用 31デシベルノイズリダクション評価 (NRR) ストラップとトラベルケース付属