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 refundPrimeTime