One Way Drinking Straw Set KIADS1. A pair of BPA free one way valve straws to reduce amount of user effort needed to drink. May assist those who have difficulty with maintaining suction or swallowing. Features:One way valve system which allows the straws to stay filled with liquid between sips.Adjustable clips to secure straw to cup.Manufactured with BFA free plastic for user safety.Please note, not suitable for semi-solid liquids or microwave use.Includes two different straw lengths to suit most cups.