Slot Strip is a specially formulated laminate of Polyester film and Dacron sailcloth. It has very special characteristics of rigidity, flexibility and tear resistance making it a perfect film to cover your centreboard/dagger-board slot to keep water out but allow your centreboard/dagger-board to pass through it. Slot Strip can also be used for transom flaps on racing dinghies and rudder/keel fairings on yachts. Slot Strip is available in either 30m rolls in a box with instructions or in a short length in a blister pack with the contact adhesive. Hawk Marine Products recommend that for DIY replacements you use a contact adhesive. The blister packs all come with a contact adhesive included.