handler was primarily responsible for two additional mattel product lines. in 1966, mattel introduced smaller dolls called liddle kiddles. handler claimed he wanted them to resemble little children in neighborhoods across america. they were sculpted by doll artist martha armstrong-hand. kiddles were a great success and continued to be produced in different versions until the early 1970s. another product line was hot wheels, introduced in 1968, which gave rise to 10,000 different models.