Clever Cards The Clever Card is developed by a Kiwi Plastic Technician and his wife. We manufacture the Clever Card products right here in New Zealand. The bio-polymer is produced into a card for easy application of the unique thermoplastic properties, technically it will melt at only 62° (that's about the same or less than a nice hot chocolate...) however the hot water should be at least 80°. The manufacturing process allows for a variety of colours as well the polymer's natural colour. When the cards melt it is safe to touch with bare hands and feels like plasticine! It takes only a couple minutes to set then it's strong and tough.