The product comes in a blister red-black, with this reference and perfectly compatible with a second set of the referenced blister red. However, I would warn buyers of this product, there are at G.SKILL a product with exactly the same reference and barcode green card delivered in luxury packaging, which will not be compatible with a set blister red black, why, I just bought this second set black red blister. Information obtained directly from G.SKILL support. If your computer and equipped with ram G.SKILL in green carton, and want to add 2 strips for 8 gigabytes ultimately, you will provide the purchase of 4 blister strips black red because the other green card no longer exists, it will avoid you galérer make a memory test to have BSOD ram and other problems. Good continuation to all.