Smiles will abound as your little one tosses, shakes, and rolls these activity balls around. Play with each one individually or link them together to create an adorable caterpillar. Five balls are included to keep baby busy – great for sensory play and fine motor skills development! - Encourages fine motor skills, sensory development, hand-eye coordination - Balls connect with vent-like ridge connectors. - Features balls with colorful rattle beads, spinning panel, fun textures, smiling face, rubber antennae for teething. - 100% BPA-Free, Lead-Free, & Phthalates-Free - Safety-certified as per European Norms (EN/CEN) and American (ASTM) Standards PRODUCT CARE NOTICE: Some parts of this delicate toy may get deformed when subjected to boiling water for a period of time using stove and/or microwave, or via steamer. According to experts, washing thoroughly with soap and clean running water is sufficient in effectively remove dirt, bacteria, and harmful viruses, just like hand washing. UV-light sterilization, while not mandatory, is okay for this toy as long as you practice the proper operation of your UV device so as not to cause harm to you and your baby.