[Premium Materials] F Dolphin pool cleaners, keep your f Dolphin robot wking efficiently it lasts longer. They are perfect f keeping your pool safe functioning properly. Replacement Pool Cleaner Timing Tracks - Keep your pool cleaner in top condition with this replacement timing track. Improve the Perfmance of Your Robotic Pool Cleaner - Wn tracks can cause a variety of perfmance issues with your automatic pool cleaner. It can start with slow movement, lack of traction on the pool flo, inability to climb walls. Don't wait until your cleaner starts to malfunction. Replace Timing Tracks in Pairs - It's tempting to replace only one track that looks me wn. But is, it 't take long f the other timing track to catch up with the wear of its paired track. Wear isn't always obvious, especially with timing tracks that wear in a steady clean pattern. But as a rule of thumb, timing tracks that are over 2 years old should be inspected f wear replaced as needed. Colour:As Shown Material:pp Package Contents: 2 Underwater robot transmission belt Only the above package content, other products are not included. Note: Light reflection different displays may cause the col of the item in the picture a little different from the real thing. The measurement allowed err is 1-3cm.