Introducing Our Losi NASCAR Tire Tubes! - Twist Top To Keep Them Secure - 3D Printed With PETG. It Won't Melt In Hot Weather Conditions. Tested In The AZ Summer. - Made When Ordered. Please Be Aware Of The Handling Time It May Take For Me To Make Them. Time May Vary. - Due To The Nature Of 3D Printing, There May Be Some Slight Imperfections.