These donut lids are key part of our Pint-sized Insect Pot with Snap-down Clips on Lid. They may also fit onto your own cups if mouth diameters are the same. The donut lid has a matt surface for retaining penciled notes. It uses sturdy 24 x 24 mesh wire netting to cope with small animals that claw aggressively.
To assemble a pint-sized insect pot, simply snap down 3 built-in clips around the rim to secure the lid to the pot.