Put in my bag when I picked up an online order of shoes but what is it? It was inside the yellow mesh thing and is 7 inches long

Lightweight resin refers to a type of synthetic material known for its low density and ease of use in various applications. This resin is favored for its versatility, durability, and ability to be molded into intricate shapes. It’s commonly used in industries like aerospace, automotive, and consumer goods for its performance characteristics.