DORSAL Bamboo 3-Fin Thruster Set is a three-fin thruster set with FCS-compatible bases, finished in bamboo. Construction: Fiberglass with Bamboo Hexcore. Fit and setup These fins fit FCS fin boxes. Confirm your board's fin-box system before ordering. Product details Size options: Medium. Color: Bamboo. Material: Fiberglass with Bamboo Hexcore. Set includes three fins for a thruster configuration. Fin specifications For surfers in the 100 to 195 pound range. Base: 4.41 in. Depth: 4.74" Area: 15.26 sq. in. Sweep: 32.9 degrees Foil: 80/20