The Black Square Corner Hard Card is second to the White hard card in popularity.This card provides a little more flexibility than the White or the Gold, but it is stiffer than the Blue. These AP1 cards are very similar to our other brands of hard cards, but they have a texture that is slightly easier to grip with wet, soapy hands and are now available in a new design which incorporates one squared corner. This new improved design makes it easier to get into tight corners when bumping edges dry and when trimming film.