Carisma Aluminum Clamping Servo Arm, 25T Black: SCA-1E Series - CIS15992 ZT0007 the Sonic 540-FT Fixed-Timing is

the Sonic 540-FT Fixed-Timing is the perfect motor for racers

Servo Size Category: Sub-Micro

Clear heavy-duty polycarbonate with protective film

ROAR approved

The Estes B4-4 is single stage engine designed for model rocket flight

Carisma Aluminum Clamping Servo Arm, 25T Black: SCA-1E Series - CIS15992 ZT0007 the Sonic 540-FT Fixed-Timing isDirect replacement to the SCA 1E plastic servo horn. Also good for M40S and 4XS. Double secured with 2 set screws on the side to provide extra security for those high torque application. Ideal use when you want the best performane and precision. Please note, high torque metal gear servo is recommended. Plastic gears will NOT work.