Two rings lock in a loose-leaf calendar refill. Standard base fits most loose-leaf calendar refills up to 3-1/2″ x 6″. High-impact, molded plastic base provides long-lasting support and is recyclable. size: 3-1/2″ x 6-1/2″ color: black material: molded plastic larger quantity quotes available. Please call 1-888-978-7759. this product arrives to most customers in 2-3 business days.