It has been shown quite recently (Morales-Rueda et al. 2003) that dB stars. extreme horisontal branch (EHB) objects in high probability all belong to binary systems. Assuming that the progenitors of EHB objects belong to the binaries with initial separations of a roughly a hundred solar radii and fill in their critical Roche lobes when being close to the tip of red giant branch. https://crowssportes.shop/product-category/ringette-visor/