It is an exclusive seat spring. It automatically open the seat by the force of the spring when the seat is open. It is also freed from the trouble that the seat closes arbitrarily. Unlike the damper type, it does not sacrifice the helmet housing space. It correspond to OEM seat base. *It is impossible to mount with V125S/[L0-]. *It is impossible to use helmet holder at the same time. *Please note that failure to install it surely may damage the seat or the helmet box.