The wide mouth straw lids fits for most of hydroflask wide mouth sport water bottles. Features: A set contains a wide mouth straw lid, 2 drinking straws and a Drinking Straw Brush. Compatible with most of Hydroflask water bottles: 12oz, 16oz, 18oz, 20 oz, 32oz, 40 oz and 64 oz. Not compatible with Tumbler Standard or Narrow Mouth bottle, Manna YETI RTIC TAL Nalgene Hydrapeak Round Bottom Growler-Beer Cup. Easy to clean. Leak-Proof Design. Flip the top and drink right away. Made of PP plastic, durable and safe. The brushes with soft bristles and a long handle is easy to clean straws easily. Specifications: Material: PP Plastic Size: Inner Diameter of Drinking Straw Lid:5.8cm Applicable Diameter of Mouth of Bottle: 5.8cm Package Contents: 1x Wide Mouth Straw Lid 2x Drinking Straws 1x Drinking Straw Brush Please Note:Ensure that your water bottle is a wide-mouth hydro flask sport water bottle before purchasing.