This lash & brow oil is an Organic blended formula which consists of ingredients that are each well-known for naturally supporting healthy hair growth to achieve fuller-looking lashes and brows. Thicker eyebrows and long lashes are the on trend style and consumers are looking for natural options to boost growth . Our castor oil contains 92+% of ricinoleic acid, which can make our oil more effective at stimulating the hair follicle. Every ingredient is organic, sourced for it's hair growth properties and bottled in a 10 ml BPA free plastic mascara bottle with bamboo or gold lids (supply chain of lids varies) and applicator brush for ease of use. We tried glass for these and the glass is so thin we had an unreasonable amount of breakage so we recently switched to BPA free plastic.