Key Features :
i : This multi-sensory learning toy contains varied contents and produces different sounds when shaken and different movements when rolledii : Constructed of hard-wearing, rust-proof stainless steel, these balls are lightweight, smooth and durableiii : The 7 balls come in 7 different sizes so that toddlers can improve their space perception and learn about sizeiv : Safety tested for children ages 12m+ so this is an ideal learning tool for toddler classroomsv : Develop toddlers' language skills through gameplay with these spheres or by describing their appearance, sound and feelvi : Great way for children to learn about reflections of different objects