Prioritize material based on your operation:

For lowest breakage (high-value, fragile eggs): Choose food-grade solid rubber.
For best value & ventilation (standard systems): Choose high-quality polyethylene mesh.
For easy cleaning & durability: Choose coated fabric.
Key checks:

Width: Must match your system exactly.
Edges: Must be reinforced to prevent fraying/curling.
Surface: Should be smooth to minimize friction on eggs.
Supplier: Choose a reputable brand for available replacements and warranty.