The flag of Hong Kong features a red field with a white, stylized, five-petal Bauhinia blakeana flower at the center. The aspect ratio of the flag is 1:2. Each petal contains a red five-pointed star, with one point on each petal pointing outward.

Color codes:

• Red: Pantone 186 C (RGB: 206, 17, 38; Hex: #CE1126)
• White: Pantone Safe (RGB: 255, 255, 255; Hex: #FFFFFF)

Geometric properties and measurements:

• The diameter of the flower is equal to 0.6 times the hoist width of the flag.
• The distance from the center of the flower to the hoist side is equal to 0.5 times the hoist width.
• Each petal's outer edge is shaped as an arc of an annulus, with outer and inner radii being 0.03 and 0.06 times the hoist width, respectively.
• The five-pointed stars have an outer circumscribed circle diameter of 0.0616 times the hoist width, and they are placed symmetrically in the petals.

These specifications ensure that the flag maintains its proportions and design when scaled or reproduced.