Bloomberg has reported that Japanese company Rengo is the manufacturer supplying the cardboard used for Nintendo Labo, according to sources close to the matter.

Rengo is a manufacturer of processed paper and corrugated packaging. In fact, it’s one of the first companies which made corrugated packaging in Japan. Sources claim Nintendo Labo only contribute a small part to Rengo’s sales. Rengo shares rose by 1.5% after the revelation was made.

Nintendo Labo launches April 20, 2018 for Nintendo Switch worldwide.