They say that they are "Plated" I guess "shiney" or "dull". Sorry I can't be anymore help. Here just alittle info:
Install the timing chain by performing the following procedure:
A.Verify that the crankshaft sprocket timing mark is aligned with the mark on the oil pump housing.
B.Place the left side primary timing chain sprocket onto the chain, while aligning the timing mark on the sprocket to the 2 plated links on the chain.
C.Lower the chain with the left sprocket through the left cylinder head opening.
D.Loosely position the left camshaft sprocket over the camshaft hub.
E.Align the plated link to the crankshaft sprocket timing mark.
F.Position the timing chain around the water pump drive sprocket.
G.Align the right camshaft sprocket timing mark to the plated link on the timing chain and loosely position the sprocket over the camshaft hub.
H.Verify that all the plated links are aligned to their proper timing marks.