BOX Four Cassette On-Ear Wired Premium Headphones or Grid priority based on

or Grid priority based on your needs

you get up to 165 hours of battery life

which are sold separately

set and disarm the system from anywhere in the world

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BOX Four Cassette On-Ear Wired Premium Headphones or Grid priority based onThe BOX Four cassette adapts our Prime 9 philosophy of durability, simplicity, and reliability at a great price point. All cogs are stamped from steel, given our durable black coating and then the larger cogs are pinned to each other with spacers for easy installation. Compatible with HG freehub bodies Steel stamped cogs No spiders Wide ratio and consistent progression ED black protection