Guidecraft Grippies Builders - 20 Piece Set, Tactile STEM Soft Grip Magnetic Building Toy for Toddlers 2017 Toy of the Year Finalist (TOTY)! Open-ended soft magnetic STEM building toy for toddlers, ages 18 mos.+. 20 piece set includes over-sized soft plastic rods and balls, with 4 unique soft-touch textures. Provides introduction to engineering. Combines tactile exploration with magnetic play. Material: Soft plastic over-molded ABS plastic rods and metal balls.