Want to reuse your Amber or Cobalt glass bottle and need a new lid? Do you need a screw cap for your glass bottle with a dropper? Well, here they are! The 1/2 oz, 1 oz, and 2 oz sizes will fit the amber and cobalt bottles that we sell. The 1/4 oz, 8 oz, and 16 oz sizes are for our amber glass bottles only, and there are two 4 oz size options; one for the 4 oz amber glass bottle that we sell and one for the 4 oz cobalt glass bottle.