1. Size and quantity: Height: 2.3cm, diameter:1cm, 4pcs in one package
2. Material and application: stainless steel, copper core, american valve cap, applicable for universal bicycle car
3. Function: Simply install on the air valve. According to the recognized color to display the pressure of the tire, red and yellow indication bar: tire pressure at below 2.0 Bar (Less than 75% of the standard), DANGER; Yellow and Green indication bar: tire pressure at 2.3-2.0 Bar (Less than 90% of the standard), WARNING; Green indication bar: tire pressure at normal range 2.4 Bar, SAFE.
