Replacement brush heads for the 360PRO Evo Sonic Toothbrush - Product Features:
2-pack of replacement brush heads
Designed for use with the 360PRO Evo Sonic Toothbrush 
Compact size ideal for smaller mouths
Soft bristles for gentle cleaning
Bristle wear indicator lets you know when it’s time to replace – when bristles are worn halfway
Recommended replacement every 6 months by the New Zealand Dental Association