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Sorry mate I made it myself
I did post on it a while back
http://straightrazorpalace.com/workshop/112570-diy-roo-travel-strop-my-take.html

not SRD but my Roo is 0.8 to 1.2mm thick
mine is 30" x 3" & rolls up to about 1 1/2" diameter

mine doesn't cup as yet (8 months old) but if it did cup it would not matter much as the leather is...