The Area 419 Clear Lexan Lid for A&D FXi Scales is made of Lexan, which is super clear and crazy strong. This lid is rock solid on the scale and doesn't require those little gray plastic inserts with felt on them. You can also see through the lid down into the cup for a better view into what's going on. This lid is compatible with the Area 419 straw replacement, and should time very close to perfect each time.