Features: brand new and high quality Control tips produce improved thrust for quick plane at lower speeds, you'll experience great control and fuel savings even when towing skiers, tubes, and boards. This pair hydrofoils is suitable for 4‑50HP boat outboard, greatly reduce fluid resistance and increase balance performance. Can provides faster planing and smoother ride by increasing stability. This kind of hydrofoil can reduce drag and cavitation to reduce fuel consumption, improve steering at low and high speeds, and can reduce bow ascent. Necessary equipment for skiers, water skiers, etc. can help skiers get out of the water faster. This boat stabilizer fins is made of high‑quality ultraviolet‑proof ABS, can withstand adverse marine environment conditions. With maximum durability and toughness, very safe to use. Easy to install. Specifications: Material:ABS Small Size:Approx.19x19cm/7.48x7.48 Large Size:Approx.44.5x36.5cm/17.52x14.37in Net Weight:655-1590g Package Includes: 1x Hydrofoil Stabilizer note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.