装修建材板块11月21日跌2.61%，罗普斯金领跌，主力资金净流出2.87亿元

Market Overview - The renovation and building materials sector experienced a decline of 2.61% on November 21, with Luopuskin leading the drop [1] - The Shanghai Composite Index closed at 3834.89, down 2.45%, while the Shenzhen Component Index closed at 12538.07, down 3.41% [1] Stock Performance - Notable stock performances included: - Zhongtie Zhuangpei (300374) rose by 3.08% to a closing price of 17.09 with a trading volume of 250,200 shares and a turnover of 429 million [1] - Sankeshu (603737) increased by 1.25% to 44.48 with a trading volume of 80,100 shares and a turnover of 361 million [1] - Luopuskin (002333) fell by 7.77% to 5.46 with a trading volume of 340,300 shares and a turnover of 191 million [2] Capital Flow - The renovation and building materials sector saw a net outflow of 287 million from institutional investors, while retail investors had a net inflow of 148 million [2] - The capital flow for key stocks showed: - Sankeshu had a net inflow of 21.43 million from institutional investors but a net outflow of 16.62 million from retail investors [3] - Zhongtie Zhuangpei had a net inflow of 11.85 million from institutional investors and a net outflow of 20.99 million from retail investors [3]