WWE Rob Gronkowski "GRONK" Authentic BLACK T-Shirt Size 4X NOS The product is an authentic WWE Rob Gronkowski "GRONK" black t-shirt in size 4XL. It is officially licensed, made of cotton material, and features the wrestler Rob Gronkowski. The t-shirt is suitable for unisex adults and is a must-have for fans of wrestling and Rob Gronkowski. This is new old stock. I did take it out of the bag to photograph. If you have any questions, please ask.