The CDC’s NIOSH intends to award a sole source contract to Cina Consulting, LLC for micro- and nanoplastic particle standards (PVC and PET) with green fluorescent labeling in 10 nm and 1 µm sizes for in vitro toxicology studies. This exact combination of polymer type, size, and fluorescence is not commercially available from other vendors, and using the same manufacturer is important for study continuity and consistency. A competitive solicitation will not be posted; instead, only one solicitation will be issued to Cina Consulting. Responsible sources that believe they can meet the requirements may submit a capabilities statement to the contracting officer via email. The government will consider this information solely to determine whether to conduct a competitive procurement.