Strap Length: 12 1/2-13 inches
Can fit up to 12 looser fit- 16 inches
Strap Width: 2 inch
Spikes sizes: 7
Spikes total: 4+5+6 inches
Back: strap
Green reacts under black light (not glow in the dark) see pics
 
center spike was put a bit akward see pics not very noticeable anyways going to low price from$395