Correct

细细

/ xì xì / 
Strokes

Example

As an Adjective

very thin; very fine

1
Bǎ
把
gùnzi
棍子
xiāo
削
de
得
xìxì
细细
de
的

whittle the stick down to a thin strip

As an Adverb

very carefully; in great detail

2
Xìxì
细细
sīkǎo
思考

think sth carefully; think through