GridLoc MightyMount XL, 9", Includes Hardware Thule The fin box material is

The fin box material is PVC

If you're gluing your fin box to a different type of surface

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Sportsman BigWater ePDL+ 132

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GridLoc MightyMount XL, 9", Includes Hardware Thule The fin box material isThe GridLoc MightyMount XL was designed as a robust but economical mount for longer footprint areas. Compatible with all YakAttack track mounted accessories, this injection molded mount functions similar to a GearTrac, and allows t bolt accessories to be installed from either end. A simple twist allows quick and easy position adjustment, but a few extra turns are required to remove the accessory, giving the GridLoc MightyMount XL the same gear