Features: The toy assists to relieve stress by playing with the stone, bring you different feeling, with more effectively help relieve the pressure and anxiety of children and adults. Applicable for various people such as inattention, which can well improve and assist daily relieve stress and irritability, and improve concentration. Soft, durable silicone, these balls feature strong magnetic connections and offer multiple play options to improve sensory development. Suitable for adults as birthday gifts, Christmas gifts, and stress relief toy, which can release the pressure of various requirements. For pressure release with colorful stone, which is suitable for offices, churches, libraries, stations, special education classes or educational purpose. Specifications: Component: Silicone Type: 4 Option Size1: Approx.4.05cm/1.59inch Size2: Approx.3.8cm/1.49inch Quantity: 2 Pcs or 8 Pcs Package Includes: 2 Pcs or 8 Pcs Sensory Toy note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color of the item.