These appear to be KD-type bogies manufactured by GREENMAX. There are six in total. I was planning to use them for a Kintetsu or similar vehicle, but I don't remember exactly. Please purchase these if you can determine their suitability from the photos. They will be sold in sets of two per case. - Model: KD Type - Brand: GREENMAX - Quantity: Set of 3 - Parts: Vehicle bogies - Parts: Couplers Thank you for looking.