Made of paper: indicates that an object or product is made from paper. It modifies nouns to mean 'paper-made ___' (e.g., paper box).
この紙製のカップはリサイクル可能ですか？
Is this paper cup recyclable?
紙製の包装材を使うことでプラスチック削減に貢献できる。
Using paper packaging materials can help reduce plastic use.
展示品は紙製のため、湿気に弱いので注意してください。
Because the exhibit is made of paper, it's vulnerable to humidity, so please be careful.