Infiniti Modules P. Ltd. Offers Blackboards with One to Five Writing Surfaces. All the Infiniti Modules P. Ltd. Offered products conforms to DIN-ISO-Standard 5970. It features green or white vitreous enamel sheet, enclosed without screws in rounded aluminum profile, with chalk rail and sponge holder. It is available with projection screens, including folding flaps. Blackboards with One to Five Writing Surfaces include height adjustment, inclination by mounting on pylons for certain models. Lineation on the boards is possible with lines, squares, music manuscripts, etc.