This is a double bottle cage for road bikes from Profile Design. It attaches to the rear of the seatpost and can hold two bottles. It also includes a holder for two CO2 cartridges, making it ideal for long rides, triathlons, and hill climbs. The lightweight and durable resin cage securely holds bottles even while riding. Highly recommended for triathletes and road bike enthusiasts. 【Product Details】 ・Brand: Profile Design ・Color: White ・Bottle Cage: For 2 bottles ・CO2 Cartridge Holder: For 2 cartridges ・Application: Road bike, Triathlon, TT bike 【Condition】 Some signs of use, but can be used without any problems. 【Highlights】 ・Popular brand for road bikes and triathlons ・Can hold 2 bottles + 2 CO2 cartridges simultaneously ・Convenient for long rides, races, and hill climbs