3x USB-C cables that are USB-IF certified. This means they're made to an independent standard, and should, theoretically, be a lot more durable and long-lasting than vast majority of cables which are not usb-if certified. Many of the more knowledgeable-seeming members of the USB subreddit recommend that USB-IF certified products be purchased due to their higher quality. YMMV.
FWIW, USB-IF certified cables don't come this cheap. Average RRP tends to be around $20-$25 for 1 cable. Do a search on Amazon and see for yourself.
If anyone wondering the length they are 1m.