S-Series Buoy 6″ x 15″ – Cobalt Blue. The adaptable S Series S-1 buoy is an excellent choice for multipurpose applications. Use as a fender or mooring buoy for small boats and jet skis. Its compact size is perfect when storage space is limited. The S Series’ elongated design allows it to sit higher in the water than an ordinary round buoy. Replace the “bleach bottle” when small pot and trap fishing with a durable, distinctly visible marker buoy. Water sport associations and competition enthusiasts combine the S-1 “boat guide” with the Polyform WS-1 Slalom Buoy as a complete course-marker package. For high-performance or leisure water sports, choose the versatile S Series S-1 for your small fender and buoy needs.. Series Applications: Small mooring buoy. AWSA approved boat guide marker. Fender for jet skis. Fits Boats 10′ – 20′. Marker for small lobster or crab pots S-Series Features: Even wall thickness for maximum strength and durability. Reinforced ropehold. Polyform’s unique vinyl valve system. Offered in 18 colors.