On the OP. PING Eye 2 irons are availble in 2 basic flavors ( there are some sub categories, but lets keep it simple).
Eye 2 are available in stainless steel or BeCu, but most sets are SS. They are wide soled perimeter weighted forgiving clubs. Most of the early sets came with a soft tip but stiff shaft, the ZZ Lite. It came in one flex (stiff) and actually worked pretty well for the masses. They launch the ball very high and are weak lofted by today's standards. Lots of offset in the head design with a nearly indestructible tumbled finish.
Eye 2+ are slightly modified version with slightly stronger lofts, modified grooves (lawsuit comment below) and slightly modified sole grinds. They were considered an improvement, but that's subjective. They, like most PING irons have no ferrules and .355 tapered hosels, so reshafting is easy but the shaft selection is smaller unless you ream the hosels to .370 parallel.
Note: you might see some Eye 2 "+no +" sets for sale. They were only built for 6 months or so during the groove brew ha ha mentioned below. They have the Eye 2+ soles, and lofts, but the old Eye 2 original (illegal) grooves. They're a bit rare and might be priced a little higher.
A nice 8-club set of both models in decent shape with matching serial numbers can be found in the $100 to $125 range. BeCu sets are more rare and cost a bit more. They are easily refurbished at the PING factory or by L&L Golf in GA. I have found sets at garage sales and thrift stores for under $50, so if you're not in a hurry.....
Sets can also be found with PING KT and KT-M shafts. There was a groove controversy/lawsuit between Solheim and the USGA back in the 80s or 90s that is an interesting read.
Check 3balls.com or Globalgolf. com, or Mikes Golf Shop.com or eBay for the thousands of sets still floating around. There are some idiots on eBay that think their sets are valuable, so ignore them.
They are iconic since they were built using breakthrough technology of investment casting and perimeter weighting in the early 80s.
My info here is subject to correction but should be mostly correct.