These bracelets can be worn with or without essential oils. The oil usually last for a couple days and then you would need to reapply the oils directly to the lava stones only. Once you place your order, please specify what essential oil scent you would prefer. Available scents are patchouli, thieves, peppermint, sweet orange, lavender, eucalyptus and lemongrass. You can also combine scents such as lavender mint, eucalyptus orange etc.