the ends 20a to be drawn apart for mounting the roller 11 on the ends second ends 20b of the h shape frame 12 on the opposite side of the cross bar 21 project through apertures 23 in the shell 10 nibs 20c are formed on the ends 20b and the shell is trapped between the nibs 20c and cross bar 21 the frame 12 thus being loosely mounted in the shell a stabiliser 28 extends laterally on each side of the cross bar 21 see fig2 and serves to limit the degree of movement of the frame and so keep the roller 11 clear of the inside surface of the shell 10 the frame is mounted in the shell by clipping the nibs 20c through the apertures 23 the flexibility of the frame 12 and thin walled shell 10 allowing this the roller 11 then is rotatably mounted on one end of the frame 12 the other end being loosely mounted in the shell to swing in the shell by a limited amount the toy will attach to and gradually run down a vertical surface in a manner which will now be described considering the roller 11 in the position shown in fig2 that.