The special flip-flopping sequins have an iridescent quality that changes colors and light refraction. When a finger traces through the scaly maze of sequins they flip over and turn black leaving a design. Roll back in the opposite direction and they return to shimmering colors. Scaly stuff also has magnetic backing to adhere the disc to or metal surfaces. Captivating, soothing tactile and visual sensory experiences for early learners or those with special needs are delivered with these 5" diameter sensory discs. Set of three, sensory experience scaly stuff.