Human made plastic particles intentionally added to consumer products, typically less than or equal to 5 mm in size. Microbeads can vary in chemical composition, size, share and density. Source: UNEP (2018). Legal Limits on Single-Use Plastics and Microplastics: A Global Review of National Laws and Regulations. p. 5 adapted from IM0/ FAO/ UNESCO-IOC/ UNIDO/ WMO/ IAEA/UN/ UNEP. UNDPP Joint Group of Experts on the Scientific Aspects of Marine Environmental Protection (GESAMP) 2015.