13 RULES WHEN TO USE COMMAS: Commas can be tricky to get right, but mastering them will improve your student's writing. Learn when to use commas and when to leave them out with this vivid and easy to read chart that lists 13 major rules of when to use commas. A MUST HAVE: Our 'When to Use Commas' poster is a must-have resource for any classroom or language arts center. Each rule is clearly explained and accompanied by clear examples, making it easy for students to grasp the intricacies of punctuation. EXCELLENT QUALITY, MADE TO LAST: Printed with vivid colors printed on high quality (100#) paper. Manufactured with double sided 3 mil thick encapsulated lamination and sealed on all sides to protect against dirt, dust, moisture and humidity. FULL SIZE POSTER: Each poster measures 17 inches x 22 inches. Large fonts and crisp graphics for easy readability. MADE IN THE USA: All of our posters are printed in the USA and shipped in sturdy cardboard tubes.