Advanced Compatibility: These filters are ideal for Plastic Water Bottles (26oz or 36oz) and Stainless Steel Water Bottles (20oz or 32oz). Note: These are not suitable for bottles without straws or the soft squeeze sport water bottle models. Enhanced Filtration Technology: Featuring a top-grade coconut shell carbon block, these filters adeptly minimize contaminants including chlorine, odors, sand, and sediment, ensuring your water is clean and fresh-tasting every time. Optimized Water Taste: Employing a high-density filtration media and an innovative design, this filter offers an expanded filtration area, resulting in improved water quality and taste -- enjoy pure, refreshing water with every sip. Eco-Friendly Cost-Efficient: Replace your filter every 2 months or after 40 gallons of water to maintain optimal performance. Not only does each filter to approximately 450 single-use plastic bottles, but it also promotes environmental sustainability and reduces your expenses. Simple Installation Process: Quick and hassle-free setup can be achieved in just three steps. Initially, rinse the filter under tap water for around 20 seconds, then insert it into the straw and finally attach the straw to the lid. Enjoy purified water immediately after these simple steps. Material: Plastic colour: Black+White Package Contents: 4 x Water Bottle Filter Only the above package content, other products are not included. Note: Light reflection 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.