A stackable ride-on toy includes a generally hollow body featuring a saddle, a handle and a primarily open bottom. 15% by mass, or a fibrous basic magnesium sulfate powder which has a ratio of the infrared absorption within the wave number range of 1,400-1,440 cm\u22121 relative to the infrared absorption within the wave number range of 3,180-3,530 cm\u22121 of 0. Signals transmitted from the V polarization transmitterreceiver 2a and the H polarization transmitterreceiver 3a are received by a V polarization transmitterreceiver 2b and a H polarization transmitterreceiver 3b of a radio 10b, and output to the interface circuit 1b. Each of the plurality of motors is selectively electrically connected with the variable speed drive and the constant power source via the switches, for driving the each of the plurality of motors at one of variable and constant speed in response to load demands.