Color classification
Three-layer [stainless steel]]
Two layers [stainless steel]]
The second layer [silver border]]
The second layer [black border]]
Second floor [gold border]]
Three layers [silver border]]
Three layers [black border]]
Three layers [gold border]]
Four layers [stainless steel]]
Four layers [silver border]]
Five layers [black border]]
Five layers [gold border]]
Five layers [stainless steel]]
Five layers [silver border]]
Four-layer [black border]]
Four-layer [Golden border]]