The Marchfunny Rowing Machine Seat Wheels are designed as direct replacements, ensuring a seamless fit for water resistance models with 45mm diameter and 8mm inner bore. Crafted with superior quality materials, they provide optimal durability, resistance, and water-tightness. These seat wheels are ideal for serious rowers, offering exceptional comfort, stability, and performance. With their durable construction and 4-wheel design, they distribute weight evenly, reducing strain on the user's back. In short, the Marchfunny Rowing Machine Seat Wheels are an indispensable addition to any rowing enthusiast's equipment, enhancing overall workout experience and longevity of the machine.