Plastic pellets, also known as hurdles or siren tears, are small spheres that are used as raw material in the manufacture of almost all plastic items. Due to their small size (usually less than 5 mm) and poor practices, pellets are often "lost" at all stages of the plastic production and distribution chain (production, transport, recycling...).

Pellet contamination in the area is recurrent and constant. In February 2019 the organization estimated that there could be up to 90 million pellets on the beach of La Pineda.