For those interested in such things, the weights of the Z series basses that Sweetwater hold:
2x Z3 4 string Rosegold: 9lb 3oz, 9lb 4oz
1xZ3 5 string Rosegold: 10lb 7oz
4x Z3 5 string Blue: 9lb 2oz, 9lb 6oz, 9lb 6oz, 10lb
2xZ7 4 string Mint: 9lb 6oz, 9lb 8oz
1xZ7 5string Mint: 10lb 1oz
1xZ3 5 string Antique white: 11lb 6oz
The Z3s above all have mahogany bodies and the Z7s are alder