Check the listing for details. Freemie Fitme Standard Inserts - 16 mm - Used with Willow cups. Color: Clear, Condition: Used. Listed at 13.00 USD. Utilized with Willow reusable collection cups and flanges to improve sizing. Fit snugly and well with the Willow. Obviously works well with Freemie system. Have not tried with any other systems. Mild discoloration on the sizing for the flange - marked these as I used 2 different sizes at one point - to tell them apart. Clean and run through my sterilizer after last use. Please review photos carefully as they are considered part of the item description. I do my best to accurately photograph and display items but I'm happy to provide more photos/measurements upon request prior to purchase. Comes from a smoke free home. If item needs to be returned, it must be unwashed, unused, free of odors and in the same condition it was shipped (at the seller's discretion) in order to receive a full refund. Full refund will be original purchase price minus original shipping costs. Return shipping costs are the responsibility of the buyer.