It is a complete tool for understanding the structure of the prokaryotic cell. This item is composed of models on the same base:

• A cross-section of a general prokaryotic cell, illustrating typical structures as pili, flagella, inclusion body, plasmides and chromosome
• Schematic representations of the cell wall of Gram-negative and Gram-positive bacteria
• A model of spore partially cut away to show all its different layers from the exosporium to the cytoplasmatic membrane. All the main structures are shown in minute detail, numbered and referenced on  included k-card mounted on board.