**Feature** Enter your model number to make sure this fits. 50 Pack - fit 18mm neck size bottles. High Quality Color Coding Labels included Buy with confidence thanks to our 100% money-back guarantee Tamper Evident Caps and Orifice Reducers A Pack of 50 X Black Tamper Evident Caps and Orifice Reducers for Euro Dropper Bottles; 50 COLORED CAP STICKERS Included for your marking convenience. The cap size is 18mm and will fit standard neck size 18-400 bottle sizes: 5ml， 10ml， 15，ml & 30ml