The plastic blend in our Paul McBeth line of discs is very close to our ESP blend. The blend is a little more "pearly" than our ESP blend, though, and we just call it the "McBeth blend" here at Discraft.
First introduced in 2006, ESP plastic was created to bring an increased grip to premium plastic without sacrificing too much durability. It beats in to fly a touch more understable than Z plastic and is only slightly less durable. The tell-tale sign of ESP plastic is the opaque, pastel-colored appearance along with a stiff but slightly tacky grip.