Premium black glass dropper with 20/400 neck finish for 1oz bottles—the go-to packaging solution for essential oils, serums, and concentrated formulas. This versatile dropper features durable borosilicate glass that shields contents from light degradation while projecting a professional, sophisticated appearance. The standardized 20/400 threading accommodates universal dropper caps for hassle-free assembly and refilling. Perfect for cosmetics, wellness products, and specialty liquids, SKU BSC-022 delivers reliable, reusable packaging that builds customer confidence and brand credibility.