6.5 lbs (around 2950 grams) on my baker's scale, with thruster fin in and a little wax and sand.
Definitely will try twin at some point, built a fish a few years ago and have my Krypto set up as a quad. Wiggling around like an idiot on waves is a blast. Going to keep it as thruster for a little bit, just to have a little more stability while I get used to things. Tried my nephew's longboard wave bandit earlier this year on the back of a boat, so I was already sold on how indestructible they are. But it is surprising how nice this small one feels. Might end up getting the 4-10 at some point, would be way easier to travel with. Can't have too many boards!