Materials: Paper Size: 23.90*15.90cm / 9.32"*6.20" Color: As shown in the picture 1. Unique design: This temperature-changing Chinese New Year greeting card is creatively designed to give friends a thoughtful New Year gift. 2. Temperature-sensitive color change: Using a igniter or a heater can change the temperature of the card, causing the color to change and making the card more interesting. 3. Good interaction: Friends can experience the temperature-changing effect after receiving the greeting card, increasing interaction and adding fun. 4. Innovative craftsmanship: Made with advanced temperature-changing technology to ensure the excellent quality and durability of the New Year greeting cards. 5. Thoughtful gift: Sending friends such a unique card not only expresses New Year blessings, but also shows your thoughtfulness and care. Package includes: 6 Temperature changing Spring Festival greeting cards