For the cost per item this is overall a really good price cheaper items usually have a cheap plastic for the roller ball which melts from coming in contact with the oils and causes leaking which can be very frustrating

I love the dark glass its essential for certain mixes to get as little sun and light on them as possible so i look forward to using these for those specific mixes

Rolls on great i love these glass rollers these havent leaked on me yet which is wonderful