Made Of As Crystal Clear Plastic Which Is Bpa Free,The Lid Can Be In Touch With The Drinks Directly. 30 Oz Replacement Lids,No Leak,Strong Leakproof Function,Help Prevent Spill While Turning Over The Tumbler. This 30Oz Tumbler Lid Is Specially Design For Most 30 Oz Tumblers Or Cups,Prevents Any Spill Of Drinks.Notice:this lid not fit for New Style RTIC tumbler A Replacement Lid Fit For Yeti Rambler:An Air Hole On Top Of Slider According Airflow Ergonomics Which Helps Reducing Splashing.They Are So Easy To Clean And So Fast, Fits for Yeti Rambler Or Old Style RTIC Coffee Tumbler,Best Gift,Unique Design Brings Great Convenience To Your Travel And Makes You Feel Physically And Mentally Happy.