The entire game is made of wood. The breadboard is wood color. The entire game is great processed. No sharp edges, no splinters. Very high quality. From each color pair each have 2 couples.
The colors are very cheerful and fun to watch.
The parts are tacky feel. It can not be swallowed.
The game stimulates motor skills, the correct mapping and naming the colors.
I would buy the game again and will also buy it again and give away. It's great for children aged 2 or later than 2.5 years, because it is not too easy, but also not too heavy, and thus provides a challenge and sense of achievement.
Addendum of 12/04/2014:
Our little son 21 months old, is already able to cope with the Steckspiel complete and correct with little assistance. It may obtain the wooden bars already safely put on the board and makes a joke of it, if he been attached the wrong ball and I shake my head. He knows exactly how to match the colors. Even if I reverse the colored balls he notices it and put the balls slowly. You can tell right, as this game promotes fine motor skills. He at least like this colorful slot game especially and we play with him every day.