The clear slider is made of styrene resin. Top and bottom transparency and vents are only perimeter for easy viewing of the inside creatures from above. The sliding lid closes tightly without any gaps, preventing small flies from entering. The separator is also standard equipped for convenience. 98 vents with 0.2 widths; Separators are fixed at a 2:1 position *We will ensure that the packaging and delivery method is complete, but the product may crack or damage when the product arrives, depending on the conditions of the shipping company, the delivery and handling of the package. Regarding breakage, we will send the replacement product the same day you contact us, so we apologize for inconvenience and inconvenience but we appreciate your reference. We will refuse any transactions in the future and will take legal action in case of malicious quality.