Incline Fit Exercise Ball Base (1 pc or 4 pcs) - Workout Accessory, Alternative to Office Desk Chair or Pregnancy Birthing Ball; Fits 55, 65, 75cm Exercise Balls; Compatible with Resistance Bands ONE PIECE YOGA BALL STAND OR EXERCISE BALL BASE OPTIONS: Select between one piece balance ball holder or four piece fitness ball base. DIFFERENT USES: Store your yoga ball, use as an accessory for your anti-burst core ball, or use to stabilize the ball if you choose to utilize it as an office chair or desk chair. Do not sit atop ball on base on slippery surfaces such as wood or tile. RESISTANCE BAND FRIENDLY: Four-piece stability ball bases include resistance band holes for resistance/exercise bands use, increasing the number of possible workouts. ONE SIZE FITS ALL: Can be used to hold workout balls ranging from 45CM, 55CM, 65CM, 75CM and 85CM SAFETY: To prevent possible injury, do not use Swiss ball while it is in or on stability ball base on slippery surface, such as wooden floors or tiles, especially if you are using it as pregnancy ball for birthing exercises.