Amazon.com: 4E's Novelty Expandable Breathing Ball Sphere (4 Pack) Toy for Kids Stress Reliever Fidget Toys Colors May Vary for Yoga Anxiety Relaxation Expands from 5.6" to 12" : Toys & Games
Hoberman Sphere Toy – Hoberman Associates
1Pc 3 Expanding Ball Toy Sizes Baby Throwing Ball Stretching Shrinking Ball Sphere Toy - AliExpress
IYAAN Twist Sphere Expanding Toy Ball Ball for Kids and Adults Home Play Use : Amazon.in: Toys & Games