Variable force spring that does not restricted to Hook's Law for compression springs that the load increases proportionally with stroke. According to your request, you can have a multi-load design. Here are some relations between load and stroke that can be used on specific occasion. 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.