Strap Length: 14
Can fit up to 12-13 looser fit- 17 inches
Strap Width: 2 inch
Spikes sizes: 5
Spikes total: 3 + 3 1/2 inches
Back: strap
Green reacts under black light (not glow in the dark) see pics, can be worn 2 ways just wear choker upside down depending on direction of spikes you want