Compared to metal, most of them are lighter. However, the high-end models come on leather bases which adds a lot of weight so that you don‘t really feel that they are lighter. Resin models don‘t feel like metal either. As resin is some sort of plastic, you feel the difference when touching them
They feel like carbon fiber when you touch them as such made objects are always molded in resin (it’s a different type from the one used in miniature models called epoxy resin, but has a similar texture).