This is a brand new, never opened, still in the original packaging, inflatable sleeping pad. Full description and pics can be seen here:
https://global.rakuten.com/en/store/arukikata/item/11420027/This is similar to the ThermaRest NeoAir that everyone seems to be going to, but it's not as lightweight, or as expensive! 72" NeoAir weighs 12oz and retails for $160
This Montbell pad weighs 18.7oz and retailed for $89. Stored size is approx. 8.5" long x 3.5" diameter, which is comparable to the NeoAir's 9x4" storage size.
$50 price includes US ground shipping, stuff sack and everything else in the original packaging (I think there's a repair kit in there too).
PM me if you have questions!