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Geekria Sport Cooling-Gel Replacement Ear Pads for JBL JR300, JR300BT, T450BT, T500BT, Tune 500 Headphones Ear Cushions - AliExpress
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POYATU JR300 JR310 BT Headphones Headset Storage Case for JBL JR300BT JR310BT Kid Headphone Hard Case Carrying Pouch Box
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Aenllosi Hard Carrying Case Replacement for JBL JR 300BT/ JR 300/ Kids On-Ear Wireless Headphones (Blue) - Newegg.com
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