This classification is based on the thresholds detailed in GESAMP report # 99 on recommendation from the SDG 14 indicator team. While the definition is in accordance with the common use of this term (as per GESAMP report # 99), alternative size classifications exist. Alternatives classifications are a piece of plastic which is less than 25 millimetres in its longest dimension, or a piece of plastic which is between 1 and 25 millimetres in its longest dimension.