Features: 1. Special Features: Four-stage filtration system Water Filter contains no chemicals, no batteries and no moving parts to wear out. 2. Rapidly Quench Your Thirst: It features a high flow rate 3. Convenient in Use: Insert it into water and drink directly 4. Safest: thoughly remove bacteria and virus, can eniminate 99.99% 5.Multiple functions, with compass, mirror and whistle suitable for survival in the wild Specification: Color: blue, green Material: ABS Filtration accuracy: 0.01m (micron) Size: as shown Package includes: 1set multifunctional filter (with straw) Notes: 1.Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 2.Please allow 1-3cm measuring deviation due to manual measurement.