The Complete Knobbed Cylinder Blocks Set is a Montessori material designed to help children develop visual discrimination of size and dimension. Each block contains cylinders that vary in diameter and height, which children must fit into corresponding sockets. This hands-on activity strengthens fine motor skills, spatial awareness, and concentration while introducing early mathematical concepts such as comparison, gradation, and sequencing. The set fosters problem-solving skills and is a key component of early childhood education environments.