Item:Customization Kit (New Horizons)
From Nookipedia, the Animal Crossing wiki
The customization kit is an item that is unlocked by completing
's Workshop on customization. Once unlocked it can be used to alter the appearance of cooperating items as some do not have the option to be customized. Once
Nooks Cranny is upgraded the customization kit is sold in singles or bulk. There is also another customization kit rebranded as the phone case customization kit which is used to alter the look of your[[[Nookphone]] using your custom designs.