Most sets are made from paper or heavier cardstock. Many product listings explicitly specify "Material: Paper" or "Material: Cardstock Paper."
Many sets include writable or blank pieces for student input (e.g., blank light bulbs or other cutouts), interactive items like puzzle pieces for students to decorate and assemble, and name- or note-ready shapes so students can add their own decorations or messages.
Listings describe classroom-grade cardstock or durable paper materials designed for repeated use. Many explicitly note that pieces can be laminated so they can be reused year after year.
Alphabet, number, symbol, and punctuation cutouts in the letter packs are printed on durable cardstock and measure about 4 inches each.
Formats include large cardstock sheets (for example, sets with pieces across ten large cardstock sheets) and prepunched or pre-cut pieces designed for quick assembly and display.