The Comet Pro is a half diamond core, which is VERY similar to the Viper core. Released in '94, the coverstock is regarded, by today's standards, to be very mild reactive resin. I have had one for over a year now. It rolls well both polished and dull. It is my "Life Preserver" when the lanes turn south and the rest of my modern, super-duper, techno stuff goes haywire. Very smooth from start to finish. Carries well in my hand. Good luck with it and if you find you like it as much as I like mine....buy another one if you can to have as a backup. I wish like hell I could find another one in 14. I would buy a case of them if I could. Again, good luck with it bro.