The only number for STX I found was the Web Site Support Service: 800-368-2250. You can try that. What do you need to contact them for? You could always e-mail STX.
Well the best thing you can do is use the web site support number. There are no other numbers on the site or on any of the product packages I have. The only thing you can do is e-mail them.
You can always go to your local lax store and ask them for the number. They would need to stay in contact with STX for their products.