The hay bridge is already fully assembled. It is made from solid spruce wood, as this material contains no harmful substances and is 100% biodegradable. It can also be safely nibbled by your pet. All our small animal houses are glued and have been nailed with approximately 19 mm small nails. These cannot be avoided and are only used for stability until the glue sets. However, the nails are used very sparingly, as the main stability of the house is provided by the glue. In the last 25 years of producing our small animal houses, we have not encountered any cases where this has led to injuries. Handcrafted, patented quality from Austria.