The peg was made of plastic and metal spring was abandoned. By altering mixture of plastic raw material, folding capability of plastic parts was improved.

这是一种全塑料的衣夹，舍弃了金属弹簧，通过对塑料原材料的混料改性，提高了塑件的耐折性能。

youdao

The court heard it was made out of chicken wire, and as the cat entered a peg was dislodged, sealing the cage with a plastic flap.

BBC: Pensioner Gordon Wilson trapped neighbour's cats in cage