BCA26589 26589 SANTA BARBARA BUTTERFLY BEACH - ... [[ 6 1/2" x 4 1/2" POSTCARD ]].. From Hibiscus Express ....//.... Our postcards are printed on 16 pt (360 gsm) premium sturdy quality cardstock. ..... //// ..... This is the maximum thickness allowed by USPS for a postcard to be mailed without an envelope.... Made in USA. .. from HibiscusExpress ... / ..- BRAND NEW GLOSSY CRISP POSTCARD 6" x 4" ready to mail