Replacement balls for Perixx 34mm trackball mouse, a great value set of 2 with different types. * Black (Standard Type): Used for a total of about 2 days. No noticeable scratches or stains, in good condition. * Red (Matte Type): Used for a total of about 1 week. Also no noticeable scratches or stains. This set allows you to try different textures and operational feels, so you can use them according to your preference. Also recommended for spares. ※ Please refrain from purchasing if you are concerned about minor scratches, as these are used items.