Great for sensory play, this set includes 7 wooden squares with fascinating centers. They promote curiosity as children examine objects, faces, environments and more through each lens. They're a great addition to STEM activities and sensory stations. Housed in solid rubberwood, these squares are extremely durable. And they're designed to last for years of home or classroom use. Small hands can easily grip the chunky frames as they play. For ages 12m+.