There is an external blade fuse that can easily be inspected - changed - 1 fuse is supplied with the pump

With oversize sleeve openings

PE ELASTOMER | SPER· Added strength and flex properties

And on top of that

FCS II FIREWIRE TRI FINS Large (75Kg - 90Kg) Carver There is an external bladeOverview Designed by Dan Mann, the new 2020 Fire Wire template is an all round thruster set with shades of twin fin characteristics. Suited to most Firewire models and high volume surfboards, the full bodied XL side fins produce exceptional hold and drive off the bottom, the smaller centre fin and unique tip design offers the projection of a twin and a surprising amount of release through turns. Supercharged and very exciting to ride. Ideal Conditions