There are large selections of various springs for brush holders. The advantage of constant force spring for carbon brush are as following: Constant pressure for commutator in any brush length. Increases brush life, reduces electrical wear. Compact design for smaller motor overall diameter that allows longer brushes and larger commutators, featuring reduced spark, lower influence of electromagnetic interference(EMI). The product range from 0.03~0.75mm in thickness and 1~50mm in width.

Ming Tai applied power spring in precision pen medicine injector, which has great performance and acquires high affirmation from the suppliers of drug delivery systems. The new type of precision pen medicine injector uses a distinctive power spring to deliver small but highly accurate doses of medicament.