Didax Unifix Word Ladders Blends Cards Set includes 12 delightful activity cards that motivate young children to make and break simple three letter words. Set comes with durable colourful cards of size 7.6cm x 41cm . - teaching notes and answers. Each word ladder requires kids to complete a series of words by changing one sound at each step down. It is designed for use with Unifix Letter Cubes and is ideal for grades 1 - 3.