You have two types of Coppins pellets, a light one which breaks down in about 30 minutes, these are the once Neil is referring to, which stick to a method, and the Harder one(darker ) as Maesknoll mentioned which still stays as a pellet after 3 hours in water.
I prefer Skrettings micros for the feeder and Coppins for 4 .6 and 8 mm carp fishing