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Kikkerland Huckleberry Make Your Own Sailboat$12.00
This set includes everything you need to build your own sailboat, complete with a sail, mast, and rudder. Attach the parts to any floating object, such as a log or a bottle, using the two included rubber bands. A 10-meter long line is included to ensure your boat doesn't get lost on the lake.
The line and the sail are water-resistant.