Yoo-Hoo Owl Thank You Cards - 24 Cards & Envelopes 24 Owl Thank You Cards and Envelopes Yoo-Hoo Thank You Cards measure 4.875" x 3.375 (USPS Standard Postage Size) Cards and Envelopes made from 100% recycled stock (White) Designed, Printed and Hand Assembled in the USA Blank Inside for your personal message!