Stress Control Cards Biofeedback Card: When stressed, your blood is drawn inward causing cold hands, and the card will register black. If so then try relaxation techniques to warm hands( Can be personalized with name, address, & phone number). Artwork charge of $75 (250 minimum order). Each order includes 10 cards. Add to your relaxation building experience with the Relaxation & Stress Reduction Workbook and Applied Relaxation audio tape.