4oz recycled PET translucent amber plastic prescription bottle. The bottles are shatter-resistant for added safety and graduations are clearly marked in both metric and imperial measurements. Made of environmentally friendly and recyclable material. Please note : Medication should be dispensed into the bottle using a calibrated measuring tool. Bottle graduation markings are not calibrated and should not be used to measure medication. The volume indicated in the product description is the estimated total volume the bottle can accommodate.