Overlord Grip Handle for 30-Ounce Tumbler (Pack of 2) ANTI-SLIP & SPILL PROOF: the handle has rubber rings on the inside of the bottom circles that hugs the tumblers very well; the lid has a silicone gasket and slider which prevents spills when closed. LASER CUT PRECISION - Guarantees to fit your beloved 30oz tumblers. Fits most standard vehicle cup holders. ANTI-SLIP DURABLE RUBBER - Designed and tested in the USA, made from high quality, BPA-free, food grade materials, adhering to ATSM Standards. UNBREAKABLE DUAL RING DESIGN - Provides the perfect amount of stability vs single ring handles even when upside down! 100% MONEY BACK LIFETIME WARRANTY - If you are not 100% satisfied for any reason please return for a no questions asked refund or free exchange. Risk Free Purchase!