A challenging 1 to 10 number puzzle for preschoolers.This inventive puzzle teaches some valuable basics: counting 1 to 10 and colors. Hand-crafted from plantation-grown rubber wood, an environmentally-friendly hardwood. Our best selling numbers puzzle. 2 puzzles in 1. Made from Eco-friendly rubber wood and colored with non-toxic stains so puzzles are safe and will maintain their beauty for generations. Helps teach numbers 1 to 10.