Coin Rush ticket
From the Super Mario Wiki
Coin Rush tickets are items in Mario Kart Tour used to give free access to the "Coins × 2" variant of Coin Rush. Without a ticket, a player must pay 5 rubies to play this variant. A Coin Rush ticket can be obtained by completing the second Tour Challenges of a tour.
"Lets you play Coin Rush without using rubies."
Names in other languages