If this is a financial query, it may refer to Mature Long-term Commercial Paper , which is a debt instrument issued for a "long" duration that has reached its "streaming" (repayment/liquidity) phase.
However, if this refers to the physical characteristics of the paper you need for a specific project, here are the most common matches for those descriptors: 📄 Likely Paper Types streaming mature long
To give you the exact specifications or a link to buy this paper: If this is a financial query, it may