Dash Ring

The Dash Ring is the special item of Ludwig, Rosalina, Blue Yoshi, Birdo (Blue), Blue Shy Guy, Rosalina (Halloween), Peach (Wintertime), Baby Rosalina (Detective), Mario (Swimwear), Penguin Toad, Mario (Aviator), Toadette (Astronaut), and the Rosalina, Dolphin and Reindeer Mii Racing Suits in Mario Kart Tour. When used, it follows the track to produce three rings that the player and opponents can use to gain temporary speed boosts, similarly to Dash Panels. The item can also pass by opponents to give them premature bursts of speed. When Dash Ring+ is active, two extra rings are tossed, allowing use for more speed. The rings will disappear after several seconds.

Mario Kart Tour

 * Tips & Tricks: "Tosses out three rings in front of you along the track. Pass through them for a speed boost!"
 * Mario Kart Tour Twitter: "Drive through dash rings for an extra boost of speed! If you're having trouble maneuvering through them, practice your steering in the Ring Race bonus challenge! Try to pass through as many as you can!"
 * Driver info: "Pass through this for a burst of speed. Your opponents can use it, too, so make it count!"
 * Driver info (Dash Ring+): "Gives you two more rings for five total, increasing your total boost potential."