Inferno Purple Reflective Maltese Cross Firefighter Fire Helmet Tetrahedrons - Set of 8 Set of 8 Reflective Tetrahedrons for your helmet Reflective Engineer Grade 7 year outdoor vinyl Meets or exceeds ASTMD 4956-99 for reflectivity Die cut right to the edge with no white or clear showing Each Piece measures just a touch over 2" at the base.