3 + 1 are 2 packs of 2 brush heads come, all specially with its own cap and 3 colored exchange rings. There are the originals from Philips with exactly the same quality, durability and appearance as the brush that was when this device. Tip: if you brush with gentle pressure, for a bit longer, the teeth are just as clean and the brush head also looks after half a year almost as good as new (apart from the discolored shift indicator bristles ;-))
Conclusion: TOP satisfied - Price at Amazon unbeaten !!!