replacement Roller Tops for Roll-On Bottles with Stainless Steel Metal Balls (12) - Fits Roll On Bottles with a .63 in / 16 mm Inner Neck

So far these are working really well and offer a smooth application. It's great to have an alternative to the cheap plastic roller tops which are poor quality and most in a package tend to be unusable. Love the consistent quality of these metal rollers.

These will only fit the tall roller bottles so if you are looking to make a roller bottle from a different size of bottle like the 5ml or 10ml, these will not work

When you use roller bottles for essential oil bottles, you sometimes get a roller that doesn't work, sticks, or leaks. This is especially true when the roller top is plastic. These replacement tops with stainless steel roller balls replace the plastic tops with issues. The flow is great and the rollers haven't leaked.

These did not fit any of my dōterra bottles, 5ml or 15ml. Such a bummer.

The steel roller balls fall out of the top. You can be rolling your oil on and the ball will just pop out and bounce away, leaving your oil dripping out.

I suppose that a mass production project is bound to have problems. some of the rollers are too tight.

Good quality and the extra ribbing helps guard against leaking.

If you were wondering if these would fit your standard YL or doTerra 5 ml bottles, they don't.