Exhibit 4.1

DESCRIPTION OF REGISTRANT’S SECURITIES

General

Our Amended and Restated Articles of Incorporation (“Charter”) authorize us to issue up to 15,000,000 shares of our common stock, no par value.

Common Stock

This section describes the general terms of our common stock that we may offer from time to time. For more detailed information, a holder of our common stock should refer to our Charter and Bylaws, copies of which are filed with the Securities and Exchange Commission, and applicable California law.

Except as otherwise expressly provided in our Charter, or as required by applicable law, all shares of our common stock have the same rights and privileges and rank equally, share ratably and are identical in all respects as to all matters, including, without limitation, those described below. All outstanding shares of our common stock are fully paid and nonassessable.

Voting Rights. The holders of our common stock are entitled to one vote per share on all matters. Par common stock does not have cumulative voting rights, which means that holders of the shares of our common stock with a majority of the votes to be cast for the election of directors can elect all directors then being elected.

Dividends. Each share of our common stock has an equal and ratable right to receive dividends to be paid from our assets legally available therefore when, as and if declared by our Board of Directors. Since February 25, 2008, we have not declared or paid cash dividends on our common stock, and we do not anticipate paying cash dividends on our common stock in the foreseeable future.

Liquidation. In the event we dissolve, liquidate or wind up, the holders of our common stock are entitled to share equally and ratably in the assets available for distribution after payments are made to our creditors.

Other. The holders of shares of our common stock have no preemptive, subscription or redemption rights and are not liable for further call or assessment. All of the outstanding shares of our common stock are, and the shares of common stock offered hereby will be, fully paid and nonassessable.

Listing

Our common stock is listed on the New York Stock Exchange under the symbol “TRT.”