this is on my Quest XPB. after shooting it for awhile,i really like this cable guard system. there is not even the slightest sign of wear on the strings. it looks to be ceramic or porceline eyes similar to a fishing pole. plenty of vane clearance as you can see. a similar design from Martin would be a good thing and also if they kept the CCS roller guard. I'm not noticing any where on the Iron Mace strings from that either. is there a reason they stopped using the CCS on Martin bows?