Vent Human Face Ball Anti-stress Ball of Japanese Design Cao Maru Caomaru-Gray Pu Colors: Gray Faces: Pu- Material: Pliable polyurethane resin Condition:100% new Designed by Makiko Yoshida, Caomaru are anti-stress face balls which let you relieve your tension by squeezing them. There are currently four different facial expressions to choose from and they are available in both brown and white versions.