Sometimes called 'Shooting Boards'. These days there seems to be more of a demand for these kind of frames. They're functional. without the bells and whistles- but if they're all you need why pay more.
Simple line work with a splash of colour, they're done quickly to keep the price down- starting from a very competitive £12 a frame for just line and from an equally competitive £16 forcolour. Order early to avoid disappointment.