Brownish gold cogs (color, not material) with a black big one. Reliable Shimano removal system. Anyway, Shimano backs 'em, so they're good.
new for 2020: they are all (mostly) silver, not brownish, they come with a removable pie plate spoke protector, and there's a 6 speed x 14-28 option, neat.
6s x 14-28 EMFTZ5106428CP
7s x 14-28 EMFTZ5107428CP
7s x 14-34 EMFTZ5107434CP