Are you looking for nesting boxes that can withstand the high energy of your youngsters? Five wood nesting blocks adorned with brightly-colored letters, numbers, pictures, and shapes challenge your child to build, count, and identify. Each one of the large Baltic Birch nesting boxes has a shape slot for fitting in the matching solid Maple blocks. The entire set is perfectly suited for new builders, with a tall lip on each block making it easier for first time builders to nest the blocks together. For ages 18 months and up.