Please note that you need to choose the variant of add-ons for V1 first, and then add to cart.
Palm Rest
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Keycaps
These keycap sets can fit with 75% layout keyboard, and they all have additional keycaps for Windows and macOS.
Switches
Keychron V1 has 82 keys. If you want to build a full keyboard you need to purchase [3 * 35 switches set].