I picked up a lot of Addi Turbos when my LYS closed its doors. All of them have tiny printing on the cables that indicate the brand, size, and length. That might help in identifying yours.
I just wanted to add that I noticed my Addi Turbo size 0 needle does not have info printed on its cable. Instead, it has a small '2' printed on one needle. This represents 2mm, which is US size 0. Just another clue that may help identify the brand of needle you have.My needles have the size imprinted on the needles, 3.75. After digging around in one of my storage bins. I think I found the packaging the needles came in. They are Inox Express. They are pretty amazing needles as the stitches just slide effortlessly. What little I can find on them suggests they are comparable to Addi Turbos but more affordable. I'm not entirely sure they are still being manufactured? I'm fairly certain these came from a thrift shop.
The Inox Express needles eventually became too short and I had to transfer everything to a longer cable needle. I ended up ordering some inexpensive needles, with a 32" cable from a random Ebay seller for less than $5. These needles are certainly a cheap imported needle from China, the kind that abounds on Ebay. They are doing the job but they aren't nearly as nice as the Inox Express. Who knew I was turning into a needle snob?