Hi, I thought it would be interesting to share with you one roll-on bottle that I quite fancy -- Fortitude Bottles. All the rollers roll smoothly and click into place easily. I was able to remove the rollers and refill the bottles without any problems. The only thing that bothers me is the plasticky smell of the rollers, but this smell is unnoticeable once the bottle is filled with essential oils and carrier. Will definitely order again.
If you also interested in roll-on bottles, you may find it here -http://www.fortitudebottles.com/product-catalogs/items/1-glassware-roll-on-bottles.html
If you also interested in roll-on bottles, you may find it here -http://www.fortitudebottles.com/product-catalogs/items/1-glassware-roll-on-bottles.html