I think my shunt is rubber, and i get a ct scan on it every year and its been fine, im going to have to get it replaced as im growing, anyway. It is on the outside of my skull under my skin. I do all i can, to protect it i just have a big coaster fetish, and The Beast helped me get over the fear of my shunt . I do not want to bring anything bad to the coaster industry whatsoever, my shunt moves all the time, not that much but it does. My neurologist says that there has been people play football with shunts, so i can as long as i be as careful as i can. I never put my hands in the are, only hold on tho the lap bar, and press my head firmly against my headrest.