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Celebrate Pi Day in style with this funny Pi design. A perfect birthday gift or gag gift for a mathematician. This top-quality, 100% cotton T-Shirt is printed direct-to-garment with new age technology that preserves the color-fastness of the design. This unique T-Shirt is designed and printed in the United States with eco-friendly ink, so it is safe for you and the environment. This durable, comfortable T-Shirt is sure to be a hit, whether you're buying it as a gift for somebody special or wearing it yourself.