Features: 1.High-quality Materials: This addition subtraction ruler toy is made of pure natural wood and all edges are smoothed so that they won't hurt kids' little hands. The patterns are printed with environmentally friendly which is absolutely safe for every child to play with. 2.Classic and Durable: Wooden ruler toy never go out of style and durable designs last for years. Our blocks are great because they can grow with your child. They can be a tool to help young children recognize letter shapes before they learn to read. Also as a building and stacking toy they can help with fine motor development and are great for hand-eye coordination and problem solving. 3.Size for Little Hands: Most toddlers still like to stick things in their mouths so the size and materials of the blocks are important. They are easy to stack and build and because there are not enough pieces to get into the mouth they are safe from choking hazards. 4.Creative and Educational Toys: The sides of the blocks are filled with letters numbers colors shapes and various patterns to encourage children to recognize letters and colors. Blocks with letters add educational value by teaching children the alphabet and learning arithmetic through play making learning to read a more enjoyable experience. 5.Customer Service: With customer satisfaction as our first priority we offer a satisfaction service for all of our merchandise. If you have any problems please contact us in time. We will give you replies as soon as possible. Specifications: Material:Wood Notes: 1.Due to the effects of light and shooting angle the actual color of the item may differ slightly from the color shown on the picture. 2. Due to manual measurement please allow 1-3cm measuring deviation.Thank you for understanding includes: 1 * Children's Mathematics Decomposition Ruler Toy "