EACH PAIR OF FOOTHILLS FANGS ARE AVAILABLE IN VARIOUS LENGTHS AND ARE SUPPLIED WITH PLENTY OF SPECIALLY MODIFIED THERMOPLASTIC. THE THERMOPLASTIC IS DESIGNED TO BE EASILY MOLDED FOR USE. JUST MELT THE THERMOPLASTIC IN HOT WATER AND VIRTUALLY MOLD THE WAX AROUND YOUR TEETH CREATING A CUSTOM FIT JUST FOR YOU. IF AT FIRST YOU DON'T SUCCEED JUST MELT THE THERMOPLASTIC AGAIN AND START OVER. THESE FANGS ARE MADE TO BE TAKEN IN AND OUT OF YOUR MOUTH REPEATEDLY THUS YOU CAN WEAR THEM OVER AND OVER AGAIN. INSTRUCTIONS INCLUDED IN EACH COFFIN (PACKAGE).