SP structure Patent No. 43312680 Patent No. US8,505,334,B2
By using a single rubber in a spiral shape, the force is distributed and the perfect fit is achieved. Even with a large design, it can be supported by two, making it stable and does not feel shaky.
If the rubber gets dirty or stretchedFrom hereYou can exchange it. Exchanges are free, but shipping costs are to be borne by the customer. The replacement time is 2 years.
