What is the core size of 150×50 four-character banner?

The core size of the 150×50 four-character banner is 3 feet 4.5 square feet. There are four flags, six flags and eight flags, and there are as many as ten flags and twelve flags. The common dimensions of banner calligraphy works are: four feet 135cmx68cm8 square feet, four feet/68cmx68cm4 square feet, four feet 135cmx34cm4 square feet, three feet100cm 4.5 square feet, and six feet10.