LB is short for the British and American unit of weight "pound". One pound is equal to 0.45359 kg. So dumbbell 4LB is a dumbbell weighing about 3.6 Jin.

Dumbbell is a simple instrument to strengthen muscle strength training. Its main material is cast iron, which is covered with a layer of rubber.

Extended data:

An ounce can represent weight and volume.

Constant ounce: unit of weight, 1 ounce equals 28.350g, and 16 ounce equals 1 pound.

Drug balance ounce: weight unit, 1 ounce = 31.1030g.

Liquid ounce: unit of measurement, 1 English liquid ounce = 28.438+0 ml? 1 American liquid ounces = 29.5438+0ml.

References:

Baidu encyclopedia -LB

Baidu encyclopedia -oz