Material : Nylon, LED,ABS

Specification:

XS size: suitable for neck circumference of 28-38cm, width of 2.0cm, length of 41cm, weight of 37g, using 2*CR2016 battery

 S: suitable for neck circumference of 34-41cm, width of 2.5cm, length of 44cm, weight of 47g, using 2*CR2016 battery

M: suitable for neck circumference of 37-46cm, width of 2.5cm, length of 50cm, weight of 57g, using 2*CR2016 battery

L: suitable for neck circumference of 41-52cm, width of 2.5cm, length of 56cm, weight of 62g, using 2*CR2016 battery

XL : suitable for neck circumference 42-56cm, width 2.5cm, length 60cm, weight 65g, using 2*CR2016 battery

Function introduction : each model has hidden switch and has 4 sections of functions: quick flicker, slow flicker, static flicker, off, and reflective effect when illuminated by vehicle lights at night.