ABBiller Low-Profile Slide Ring (replaces both SLR & SPR) - Force-E Scuba Centers
Shop Oura Ring Gen3: Horizon Silver
Stainless Steel Guitar Tone Slider / Guitar String Ring Slides for Tone 70/60/40mm|sliding cupboard|slide dimmersliding door bottom roller - AliExpress
RIFFE Loop Slide Rings for Ice Pick Slip Tips spearfishing – RIFFE Web Store
I Did It: Ambient Slide EBow Guitar (Black Mountain Slide Ring ) - YouTube