These stress balls are made of PU foam material, sturdy and reliable, not easy to fade or break, firm to accompany you for a long time; With nice elasticity, these balls are comfortable for you to touch and hold, providing you with a good hand feeling. This ball is a good choice to relieve you from stress, allowing you to spend a time of peace and relaxation. These funny stress balls can be well applied on a lot of occasions, such as hand exercise, fidgeting toys, gym, home, office.