- - -. Expert tip: Cardboard tubes can be easily shortened and combined with other tubes and straws made of straw, reeds or bamboo. This way you create a varied bee house that is suitable for every species. Species-appropriate: The moisture repellent layer and the two different diameters make the cardboard breeding tubes an excellent accessory for your masonry bee house. Transform your garden or balcony into a paradise for wild bees and insects. Perfect fit: 300 precision-made cardboard tubes with 6 and 8 mm diameter - each 150 pieces 15 cm long. An excellent filling material for crafting your wild bee hotel. As recommended by NABU and without substances that harm people or bees. Like a professional: You will receive the 20-page e-book 'Bienenglück' (English language not guaranteed). -.