Constructed of durable .5mm 304-18/8 stainless steel Unique golf ball texture design for a distinctive look Triple insulation technology: double-walled, vacuum-sealed, and copper-plated Silicone base for slip-free, scratch-free, and noise-free stability BPA-free X-Large EZ Slider Lid with removable slider for easy cleaning Condensation-free and non-breakable Fits most standard cup holders