Genuine Blue 10 ml Glass Roller Bottles with Stainless Roller Ball; Set Six Bottles with; Ultra-Premium Thick Glass with Small Lids that Seal TightlyEnter your model number above to make sure this fits.Stainless steel roller ball glides on seamlessly and effortlessly.The blue glass protects your precious oils or perfumes from harmful UV rays.Extra roller just in case you need or ever lose. We cannot guarantee it will fit other rollers but MAY fit in other 10 ml roller bottles :).Extra tight fitting lids.Ball will stay in tact regardless of oils used. This is different from plastic which may deteriorate with use.Six VERY high quality true blue (not painted) roller bottles that allow for the most convenient and economical use of essential oils. Not all roller bottles are made the same and you will find that these rollers are at the top of their class. High quality blue glass that is not easily broken makes these portable and great for travel. Use for oil blends， lip glosses， perfumes and more.