Robbe RC submarine U31 CLASS 212 set For advanced users (large submarine assembly kit) / Scale: 1/40 Size: total length: 1430mm overall width: 180mm height: 470mm gross weight: 19000g Hull assembly t kit set, Sendai, assembly instructions (Dokubun / English) 1-1216 dedicated brushless motor power set in this set, 1-1217: Contains the ballast set. separately 1) brush motor controller 2) Battery 3) R / C propoxycarbonyl (computer propoxycarbonyl: minimum of 4ch) Etc. is required.