Lamy2000, studio, and CP 1, the latter two have steel tips and gold tips, but they are all inked by ordinary methods (rotating inker). Lamy 2000 only has a gold tip of 14K gold, and it is semi-bright and the piston is inked, so it is difficult to imitate (so there are no fakes yet). The products produced now are all new models, which have solved the problem of rod explosion and ensured the quality. The feel of gold tip is generally better than that of steel tip, while the feel of Lamy 2000 is hard and slippery.

The student party generally chooses EF or F-tip, and recommends F-tip. Because Lamy's quality control is not the best, the probability of EF tip scraping paper is high and the running-in time is long. F-tip is much better, and there is not much difference in handwriting thickness between the two. At present, the price of brand-new Lamy2000 on Taobao is about 700. Since it is a gift, it is better to buy a brand-new one.

These three are all pens. I don't know what you mean by changing the refill. Studio and CP 1 can use Lamy ink cartridges, but the cost of replacing ink cartridges is high, which is not as cost-effective as ink.