12 mm. 12 mm.
The "mm" is the abbreviation for millimeters. So "12 mm" stands for "12 millimeters"
Just over 0.25 inches.
12 inches is equal to 304.8 mm.
If you have a length of 25 mm and then 12 mm it makes a length of 37 mm.
Betweeen 4 and 6 mm. The most common is probably 5 mm.
12 cm = 120 mm
12 feet is 3,657.6 mm
12 ft = 3,657.6 mm
Surface area of the ball = 4*pi*342 = 4624*pi square mm
0.4724" Direct Conversion Formula 12 mm* 1 in 25.4 mm = 0.4724409449 in
2.7 gram, 40 mm diameter. (introduced after the 2000 Olympic Games)earlier it was 38 mm. (40 mm table tennis ball is slower and spins less than a 38 mm one).Stars on the ball indicate the quality of the ball. 3 stars indicates that it is of the highest quality, and is used in official competitions.