Features: Package Include 4 Pack Part number# 6101611-R4 climbing rings; 2 Pack Part Number# 9985006-R2 Pool Cleaner Timing Track. Designed for tackling worn tracks that cause your automatic pool cleaner to move slowly, lack traction on the pool floor, and fail to climb walls. Our climbing rings solve this problem by providing superior traction and grip, ensuring that your pool cleaner can easily access every cranny of your pool. Suitable for robotic pool cleaners like DX3, DX4, DX6, M200, M400, M500, Nautilus, Nautilus Plus.Matching these part numbers to ensure fit for your Dolphin pool cleaner. They are perfect for maintaining your pool safe and functioning properly. Specifications: Component:ABS Size:Approx.39.2cm/15.43inch Package Includes: 4Pcs 6101611-R4 Climbing Rings 2Pc 9985006-R2 Track note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.