Your brand new joy-con set comes with a 6 month joy-con drift warranty. If you're unlucky and get joy-con drift within 6 months of your purchase I fix it for free. If it happens anytime after that, I will fix it for just $10 no matter how long ago your purchase was!
All my joy-cons are brand new. Many other shops use refurbished/used joy-cons, and that is more likely to lead to quality issues or joy con drift in the near future. Your purchase also includes a pair of wrist straps and the original box.
Your Nintendo Switch will recognize your joy-cons as the proper color. For example, if you order atomic purple joy-cons, they will show up as purple on your Nintendo Switch home screen.
If you have any questions or concerns, feel free to send me a message. I do offer mixing and matching for a $10 fee.