8-Set Archery Bowstring Finger Guard, Bow String Finger Savers, Recurve & Traditional Archery Fingers Guard, Fits Open-End Bowstring, Essential Accessories for Hunting, Target Practice, Black

At the ends are the loops and often you also see serving thread winded around them for additional protection. What you probably refer to are "finger savers". Rubber tubes which you indeed slide on the string. https://www.amazon.com/NRJSSCC-Bowstring-Traditional-Essential-Accessories/dp/B0G1FZ9WZQ It is better to use a tab. No need for an expensive tab, this one (for splitfinger style) https://www.amazon.com/Bicaster-Archery-Finger-Genuine-Leather/dp/B087WQNFG3 Or thisone for barebow: https://www.amazon.com/BICASTER-Barebow-Finger-Cowhide-Aluminum/dp/B09QMDH25C Are good enough for starting out.