Applicable models: Propeller Speed ??Controller, Especially designed fit for ET54L 44L 34L. Product Description: Professional manufacturing, exquisite workmanship. The utility model has the advantages of resistance. Excellent performance: High quality precision parts, designed to improve machine performance and efficiency. Replace old or damaged directly. Precision material: Ring Set is made of high quality material, the is smooth and comfortable, light weight, high temperature resistance, not easy to deform, not easy to damage, resistance, ensuring maximum durability. colour:Black Material:ABS Package Contents: 1 x speed switch Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.