12 Pack Stress Relief Balls Great value total 12 packs, in 12 different colors, Release stress and tension,exercise finger flexibility. Safe Material These high-quality extruded slow rising stress ball are officially certified by CPC and made of thermoplastic rubber (TPR) to ensure durability. Easy to Clean The squishy stress balls are not sticky and easy to clean. Wash gently with soap and water and play again. Durable &Portable You can use these sensory squeeze ball for squeezing exercises repeatedly and create fun shapes with these malleable sensory fidget toys.