Roll your uncored paper background on this 12' ALU Core. This keeps your Background from kinking and also allows the use of Manfrotto's Expan Drive system. 2 section design makes for easy storage and travel. This replaces the Manfrotto 2928. Aluminum core in 2 sections: 50mm for uncored back round paper. Diameter: 1.97 in.; length: 144.09 in.; material: aluminum; weight: 5.06 lbs.