listing is for one, NANKAI (NK) coaster brake large ball retainer. new old stock from the 70's and in great condition with hardly any shelf wear. made by Nankai Tekko co. of japan. cage measures 1 3/8" in diameter. in great condition with hardly any shelf wear. I have other parts for these hubs available also. These are also compatible with vintage New departure model C and D coaster brake hubs from the 1920's-50's. stock photo. I will combine shipping for multiple items.