【Package Contents】: The set includes 5 replacement heads, available in two different colors: black or white. 【Cleaning】: Regularly replace the toilet brush head to maintain cleanliness and hygiene. 【Easy to Install】: Simply remove the old one and install the new one: the head diameter is 7 cm. 【Note】: This is a 4-contact spiral interface head, which must be paired with a matching handle (handle not included). Suitable interface inner diameter: 9 mm-10 mm.