Lost, damaged, or simply need a new filter for your bobble? These six carbon filters are fully functional standard replacements for bobble water bottles. Bobble and its filters are made from FDA approved recycled PET that is free of BPA, Phthalates, and PVC. Due to these properties, it"s handy on-the-go filtration, and the entire product being completely recyclable, bobble is featured as one of Oprah"s favorites for eco-friendly products. Before first use, simply rinse one bottle full of water through each filter to remove any loose carbon. Each filter is recommended to be replaced every 2 months or after 40 gallons of water have been used (roughly 300 refills).The bobble filtered water bottle is a revolutionary step in achieving filtered water in a convenient, efficient, and environmentally friendly way. Utilizing a high quality patented carbon filter, bobble"s water bottles help you save money by offering a system that filters your tap water as you drink, and eliminates the need to purchase costly bottled water. 1-1/2" diameter x 4-1/2" H