I have no complaints about the performance of these springs. The rubbery ones that most styluses have are stylus pens? - May stick to tablet/phone surface. The mesh on them helps the pen slide smoothly across the surface, but the mesh wears out too quickly. The way people hold the pen tends to create a "flat spot" in one spot. The price of the feathers themselves is reasonable, but the shipping costs are ridiculous. (Not related to the product review, I know.)
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