I have Classmates Octane gel pen. My 1st pen finished 2 days. Pen body material bis very good excellent I have bought 10 packages. I am suggesting to you. That pen refill could be better pen body will not wast in trash. When Reynolds pens Lunch. They also launched refill pen in pack to Re'USE PEN body. So, I request to Re'USE Classmates pen body change refill. Best Regards, Sai Ganesh Contact- +91 6301* 01626