KST X15-1208 Mini Size Digital Servo is a great choice for helicopters ranging from 430mm-570mm rotor blade size requiring mini servos such as the Align T-Rex 500, Mikado Logo 480, MSH Protos 500, and SAB Goblin 570.
KST X06 Micro Digital Metal Gear Servo (Horizontal Mount) [KST-06H]
KST DS565X Helicopter Tail Mini Digital Metal Gear Servo [KSTDS565X]
KST X06 Micro Digital Metal Gear Thin Servo [KST-X06]
KST DS589 Cyclic Mini Digital Metal Gear Servo [KSTDS589MG]
KST DS215MG V3 Micro Digital Metal Gear Servo [KSTDS215MGV3]
KST X12-508 Micro Digital Metal Gear Servo [KSTX12-508]