Honda cafe seat for your Honda or whatever custom bike you want to put it on.
Pretty decent size for moped top tanks or small motos. Adjustable or even removable mounts make it easy to adapt to multiple frames.
Overall length is 20". The part you sit on is about 14.5" long. Roughly 9.5" wide at the widest portion near the rear. Just shy of 7.5" where the seat meets the tank.
2.5" thick where you sit. Rougly 4" thick at the rear hump.
Rear mounts are a rectangle pattern that is roughly 4.5" and 1.5". The bolt pattern on the front removable mount is 1.5" wide.
The seat itself weighs 2.6 lbs.
Don't want it to say Honda? A bit of carburetor cleaner and some elbow grease take care of that.