The normal tension roll paper spindle handles both 2inch and 3inch paper cores and is used for the majority of Epson media.
HiTension Roll Paper Spindle
The optional hitension roll paper spindle handles both 2inch and 3inch paper cores and is designed to be used with the following Epson media;
Ultrasmooth Fine Art Paper, Epson Textured Fine Art Paper, Epson Watercolor PaperRadiant White, Enhanced Synthetic Paper and Enhance Adhesive Synthetic Paper.