Mechanical Building Set builds ten different models with 120 colorful flexible parts including gears and wheels. This set includes a convenient storage bucket, tools and instruction booklet. It has new flexible pieces that add a whole new dimension of fun to the creations a child's active imagination.

Erector Mechanical Building Set builds ten different models with 100 colorful flexible parts. It includes a 6V motor, convenient storage bucket, tools and instruction booklet. It has new flexible pieces that add a whole new dimension of fun to the creations a child's active imagination.