Introduction Boston bottle with plastic dropper is a plastic dropper which is for boston glass bottles. The diameter can be 18mm, 20mm, 22mm, 24mm, 28mm. The length of the glass tube can be made according to your bottles. Used inCosmetic, essential oil, or chemical applications Size 18mm, 20mm, 22mm, 24mm, 28mm Material Plastic, glass Color Black, White or Customized Plastic Dropper suppliers website:http://www.jysuccesspacking.com/cosmetic-dropper/plastic-dropper/