How Are We to Understand Paul’s Request to Timothy ‘Bring the Scrolls, Especially the Parchments’?

2 Timothy 4:13 Updated American Standard Version (UASV)
13 When you come, bring the cloak that I left behind in Troas with Carpus, and the scrolls, especially the parchments.

In not so many words, the apostle Paul urged his fellow traveling companion Timothy to bring him different types of written material. What did Paul mean by the scrolls and parchments?