MasterVision Magnetic Numbers make building and maintaining your planning board easier. Arrange data easily and quickly when changes become necessary. Use with MasterVision Magnetic Planning Boards. These magnetic letters measure 1/2 x 3/4 inches and are red and white. They are ideal for other magnetic surfaces as well, such as file cabinets. Bi-silque, S.A., is a family-owned multi-national leading Visual Communication Products manufacturer, with headquarters in Esmoriz, Portugal. Founded in 1979 by the Vasconcelos family, Bi-silque started from a visionary business dream in a small garage. Now the company has more than 40 years of know-how in product development, manufacturing, distributing and customer support, and sells currently to over 80 countries in the 5 continents through its Bi-Office, Mastervision and ARCHYI. brands.