Setting for the Xtool S1 40 Watt that worked best for me are (Power 100, Speed 200, LPI 140 Passes 3) On most colors. The white required 5 passes. My testing showed that under 200 Speed will damages and over burns the tag. Below are Amazon Links to bulk Silicon Tags in Various Shapes and sizes:
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Small Round Tags https://amzn.to/3V305Gz
Large Round Tags https://amzn.to/48mAZoI
Heart Shaped https://amzn.to/3IbzAGV
Pack Original Silent Hexagon Shape https://amzn.to/4bEP7wH