Hi -
Can anyone tell me what the bottom bow in the picture is made of?

I know the top one is the Glasser cheapest bow, fiberglass, plastic grip, no eyes, etc. I believe the bottom bow is made by Glasser, but I don't know if it is the "Advanced Composite" the "Carbon Graphite" or what. Any information will be greatly appreciated.
Bow bows are for standard 3/4 string bass.
Thanks!