You are looking at Zazzle's custom Massachusetts envelopes section, where you can find a variety of Massachusetts designs for standard #10 envelopes. Measuring 4 1/8" x 9 1/2", Zazzle #10 envelopes are available for customization or ready to buy as is. Most Zazzle custom envelopes ship within 24 hours after the order is placed. Add a personal touch to your business envelopes with free images and text! To see other related products, check out the main massachusetts page.