These roller bottles are absolutely wonderful. My husband makes Colloidal Silver and we were able to share this with several friends using these bottles.Colloidal Silver needs to be kept in a dark glass bottle and these fit the bill. I used a couple for essential oil blends as well. I was able to mix peppermint oil with coconut oil for a carrier oil and use it for home headache relief. I made a second blend of lavender and coconut oil to help with sleep at night. The price for these is very reasonable and I would recommend them for anyone who is looking for a good quality roller bottle. I received these bottles for free in return for my honest review after using the product.
Here is the link to find these on Amazon https://www.amazon.com/dp/B01FE66GH0/ref=cm_cr_ryp_prd_ttl_sol_0