To demonstrate arragement in order of width, form and color. Each shape consists of two sides for color and shape matching. Thus, a child can build up the joker step by step. 11" x 4.7" x 4.7" Plan Toys combines learning with fun! They are specially designed to variously enhance child development for all the different age groups. The raw material is rubberwood (hevea Brasiliensis), which is recovered from ageing rubber trees grown by Thai farmers primarily for latex. Preservative-free Rubberwood.