28mm Standard Dropper Cap

This dropper cap is manufactured with only the 400 thread standard and precise dimensional tolerance. It forms a tight fit with matched bottle necks and prevents thread slipping or loose assembly after repeated twisting.

Designed with continuous full stripes on the outer wall. The textured surface enhances friction during rotation for effortless opening and closing, meanwhile presenting a neat and unified packaging appearance.

Tailored for 28mm large-diameter bottles with a well-matched internal sealing structure. Once fully tightened, it effectively slows liquid evaporation and avoids leakage during transportation and long-term storage for large-volume essential oils and serums.