Package of 7 replacement Tube Collars for a single roller. Full double-roller systems use 2 packs, but most replacements only need a few extras if ever.
Tube Collars are pressed onto larger tube ends that receive the next size smaller tube, and provide snugness and support between gaps in tubes. See the Solar Roller instructions that came with your kit.
Parts seldom have issues, but as with most products we offer replacements.