Fender panel for cell fender and cone fender.
It consists of the closed-cell frame, on top face pad it is UHMWPE sheet, with connection bolt to connect together.
It is attached to cell fender or cone fender by chain bolt etc.
Details please check link: https://www.ytmarinefender.com/cell-fenders/ and https://www.ytmarinefender.com/cone-fenders/.