This smallest Chuckit is Amazing! It works great for my 4 year old and 18 mo old grandsons. At first we would pull the ball out so it was barely gripped by this 12" Little chuckit. Then as the boys got the hang of it they could loosen the grip on the ball themselves and finally -- all in the same day and same few hours -- they were chucking the balls for my Aussie full speed and laughing and giggling like crazy.