Specifications. NOKIN road stud, raised pavement markers, retroreflective plastic, lane divider, cat eye road stud, reflective road marker, road side reflector. Super plastic road stud: Exceeds ASTM D4280, EN1463-1 Standard Size: 100 x 100 x 18mm Color: white, yellow, red, green etc. Weight: 175g Load capacity: 17 KN Photometric values: double