From Magna-Tiles®, this set features: Recommended use: ages 3+ 12 small squares 3 large squares 9 equilateral triangles 10 right triangles 6 isosceles triangles 1 wheeled chassis 2 imagination pieces 2 equilateral triangles – hole punched 1 arch 1 square door frame 1 magnetic hinged door STEM approved: encourages development of  math, science, spatial, and tactile skills and fine motor skills Sonic-welded with stainless steel rivets, these magnetic tiles are scratch-resistant and durable made with non-toxic paints and durable, food-grade ABS plastic that’s BPA-, phthalate-, and latex-free Package weight: approx. 5 lbs / 2.3 kg Package measurement: approx. 18.5 x 3 x 13 inches Item measurement: each shape has a base measurement of approx. 3 inches / 7.62 cm Compatibility with all Magna-Tiles® sets Imported. *Returns not accepted on any opened, used, or defective product. Contact manufacturer customer service directly for defective products/parts.