Our Gemstone Roller Balls are Great to replace the fitments in all your standard dram and 10ml rollerball bottles that we sell. (not the slim style) when you change oil blends, change to a cool easy rolling roller ball! they snap in easily and roll well! (will not fit Doterra or Young Living) THESE ARE PREMIUM ROLLERBALLS Choose Hematite, Carnelian, Rose Quartz, Red Aventurine, Sodalite, Clear Crystal Quartz, Green Aventurine, Red Aventurine, Yellow Tiger Eye, Brecciated Jasper, Rainbow Fluorite, ♦♦♦♦ . It's always a good idea to test a bottle with your product before purchasing a large amount of bottles. -- These Fitments, although the highest quality, may still not work with Certain Essential Oils or Blends, such as those that contain Frankincense or Citrus Oils. They may dissolve the seal on the rollerball assembly, but we don't expect that will happen.. Also, do not place carrier oils in bottles using these rollers. the balls may pop out. For best usage, these should only carry pure perfume oils, and diluted essential oils. ♦♦♦♦