Officially Licensed University of Oklahoma Boomer Sooner "OU" Silvertone Dangling Crystal Stud Earrings Round OU Charm Hangs from Large Clear Crystal. Post Back Earrings Hang 1.25" L x 0.5" W. Officially Licensed Product Arrive in Gift Box! See our Storefront for our coordinating OU Crystal Stud Pendant Necklace & our entire OU selection!