The 90 lbs limb should only be used with arrows weighing 155 grains or more.
 
What's Included
1 limb
1 black/orange string (grey heavy-duty string for PRO Magnum and Hunting)
1 QD Limb block
2 polymer limb tips (aluminum for PRO, Magnum and Hunting)
1 stringing aid
 
Compatible With
All AR-Series crossbows (except Stinger I)