Concentration of Credit Risks and Uncertainties

6 Months Ended

Nov. 30, 2011

Risks and Uncertainties [Abstract]

Concentration Risk Disclosure [Text Block]

20.  Concentration of Credit Risks and Uncertainties

Concentration of credit risk exists when changes in economic, industry or geographic factors similarly affect groups of counter parties whose aggregate credit exposure is material in relation to the Company’s total credit exposure.

No customer accounted for more than 10% of the Company’s total sales for the six months ended November 30, 2011. Three major customers, China Railway Construction Group, Jiangxi Jinggangshan Roand and Bridge Construction Company and China Construction Group accounted for 17%, 16%, and 10% of the Company’s total sales for the six months ended November 30, 2010, respectively.

No customer accounted for more than 10% of the Company’s accounts receivable balance at November 30, 2011. Three customers, China Construction Group, China Railway Construction Group, and Guangzhou Tianli Construction Group accounted for 11%, 11%, and 10% of the Company’s accounts receivable balance at November 30, 2010.

One major vendor, Ren Pei Xiong Stone and Sand Factory, accounted for 11% of the Company’s total inventory purchases for the six months ended November 30, 2011. Two major vendors, Tangshan Jidong Cement Company and Hekai Stone and Sand Company, accounted for 12% and 10% of the Company’s total inventory purchases for the six months ended November 30, 2010.

No vendor accounted for more than 10% of the Company’s accounts payable at November 30, 2011 and November 30, 2010, respectively.