These educational toys are specially designed for pre-k children.

pre-k 是 pre-kindergarten 的缩写形式，pre- 是前缀表示"在...之前"，kindergarten 指"幼儿园"。pre-k 合起来指"幼儿园前的"，通常指3-5岁尚未上幼儿园的学龄前儿童。