Return Policy Fast Delivery Trusted seller 4 Pack Indoor Cycling Snap Rocker Feet Adapters with 8 Pack Tennis Balls, Stability Accessories for Smart Bike Resistance Trainer Home Workout Equipment Product Description PERFECT REPLACEMENT - Ensures seamless integration and compatibility with Wahoo Kickr Core, facilitating a straightforward transition and eliminating the need for extensive adjustments or modifications.In case of severe wear or replacement, you can easily remove the old ball and install the new ball, without the need for complex operations. DURABLE & WEAR-RESISTANT - The balance ball on the joystick board is made of high-quality wear-resistant materials, ensuring excellent stability during long-term, high-intensity indoor cycling training. This design not only increases the stability of the product, ensuring the safety of users during exercise, but also effectively prevents the floor from being worn out. INCREASE YOUR COMFORT - Embrace the suffering but ease the pain with added movement and comfort by our Cycling Rocker Balls Feet. Combined with the proper plates, these 67mm Diameter balls provide 10° of total horizontal motion to help you to move with the bike rather than against it decreg static pressure on your joints while you crank out your indoor sessions on Wahoo Kickr Core. IMPROVES BALANCE AND ENGAGES YOUR CORE - Breathe some life into your once-motionless trainer rides. With the added movement comes added engagement of both mind and body. The Cycling Replacement Rocker Balls add that extra motion to your core muscles and overall balance ensuring you maximize every second of your indoor training time. Choose our replaceable joystick balance ball to make your indoor cycling training more stable, efficient, and safe! Upgrade your cycling equipment quickly and enjoy a more enjoyable sports experience! Shipping Returns Payment Shipping Shipping is FREE to all addresses other than APO/PO boxes in the lower 48 states. All our stock ships from US-based warehouses. Shipped via USPS or UPS (depending on location and package weight) Unless stated otherwise, all orders will ship within 24-72 hours of your payment being processed. Check our feedback to see the great reviews of FAST shipping we offer. Returns Seller does not accept returns Payment We currently accept payment via eBay managed payments only. Once payment is cleared, we will dispatch your shipment within 1-3 business days. Please refer to the "Shipping" tab for more information regarding shipping speed to your destination.