These paper cups will fit all the sand divers and serve as the sand ballast engines. They can be decorated and re-used for each dive. Each has a volume of 3-oz (88.7 mL).
 
*Holes need tape closed when used with Rocket Diver. Sand not included. Follow all regulations when launching into a public or private location. Attach a fishing line or string to sand divers as a backup retrieval method. Seller is not responsible for any damage or losses.