What size is a Superking Pillowcase? Rebecca Leonard August 22, 2018 13:04 Updated Follow Our Superking Pillowcases measure 50cm x 90cm. The internal flap measures 20cm. Shop Superking pillows. Related articles What size is a standard pillowcase? What is a Housewife pillow case? What size is a Jumbo Towel? What type of weave is used for our Percale cotton? Comments 0 comments Please sign in to leave a comment.