Usage Tips:3 & 5 Gallon Water Jug Cap: you'll get 30 Pieces blue non spill water bottle caps, inner caps design turn the non-spill caps into reusable and , refill your water jug for recycling use and saving money. Safety Material: Our non-spill lids for water dispenser are made from plastic. The water bottle Caps with peel-off dust protection seal. Non-adhesive, mainly compatible with bottle water coolers. Three-Piece Suit: Upgrade Non-Spill Plug system, no splash, no leak, sealing strong than universal caps, clean and safe to create a sterile environment for crystal-clear water storage. Outer protection non-splash caps for dust - proof. Great : Water bottle snap on cap applicable to 55 mm 2,3 or 5-gallon water bottles, recycling use and saving your money. Perfect for snap top bottles, not for use with screw top bottle. Multiple Occasion: The center button stays attached to the cap once it's placed, instead of floating around in the water; also for water jug on top rack or with water pump in both family and office. colour: blue Material: plastic Package Contents: 30 x water jug Cap Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.