Correct

市丝

/ shì sī /

Strokes

Example

As a Measure word

si ［a traditional unit of length, equal to 0.00001 chi （市尺）, to 3.333 microns（微米）］

As a Measure word

si ［a traditional unit of weight, equal to 0.000001 jin （市斤）or 0.5 milligramme（毫克）