Made with engineering ABS and PBT bristle, The bristles are fine tough and durable, which makes it easier to do deep cleaning. They are not sharp so that won't hurt your hand efficiently clean hard-to-clean dirt without bend after use. The brush body has radian, which is in line with the ergonomic design and can be grasped comfortably and prevent slipping. Open the lid and fill dish soap, press the button to spray the washing liquid, very convenient to use and reduce unnecessary waste Soap scrub brush set comes with 3 replaceable brush heads, including a PBT bristles brush head, a sponge brush head and an emery brush head