LEGO© City Cement Mixer (Set #7990) by LEGO. $79.85. Lego City Set #7990 Cement Mixer. Help build the City!Get ready to build some new roads in LEGO City! Pull out the long flexible hose, rotate the drum to mix the cement and pour it out!* Includes worker minifigure and accessories!* Cement drum really turns!* Truck measures 7" (18 cm) long!