This is a Montessori material called the "Horizontal Straight-Line Peg with Sliding Disc." It consists of a wooden base, an L-shaped metal rod, and a green circular sliding disc that moves along the rod.

Features and Uses:

1. Fine Motor Skill Development: Sliding the circular disc helps children enhance hand-eye coordination and refine their fine motor skills.

2. Exploration and Spatial Awareness: Encourages children to explore how the disc operates and understand the concept of spatial relationships.

3. Focus and Concentration: The repetitive action of sliding the disc helps children improve their attention span and ability to concentrate.

4. Sensory Stimulation: The green disc provides visual and tactile stimulation for sensory development.

This material is suitable for infants aged 6–18 months and aligns with Montessori principles of independent exploration and hands-on learning, offering early opportunities for motor and sensory skill development.