I was initially not keen to buy glass beakers for my candle making workshops, because I thought they potentially break too easily. So I bought plastic beakers. What a mistake that was. The oils dulled and softened the plastic, an dit wasn’t too long and I couldn’t read the measurements. I replaced them all with the glass beakers and am annoyed at myself for not using them right from the start. I also love the fact that I could purchase the very small size (40ml) Its perfect for candlemaking.