Length: 32 inches (Approx 80 cm).
Width: 1/2 inch (Approx 1.2 cm).
Weight: 1 1/4 ounce (Approx 35 grams).
As we are dealing with a product that stems from a natural source (indeed it stems from a stem!), you do get some variation.
For a long time, the standard was 36 inches in length, but legal problems were identified with that length.