Fits my Sonicare ProtectiveClean 4100 perfectly
[[VIDEOID:9c031ea1bf8ce8939c7a1f7de02174e]] The bristles on my Sonicare toothbrush were finally wearing down, and I only have one official C2 replacement brush head left. I didn't want to pay nearly ten bucks a pop for official brush heads again, so I decided to get a big pack of off-brand ones. These are a RIDICULOUS value--at basically a buck a piece, they're like 1/10th the cost of the official bristles.<br /><br />In terms of firmness, I'd say it's about identical to the C2 brushes that came with my toothbrush--medium firmness, not gentle bristles. The size is slightly larger and less angled, but it doesn't leave me feeling wanting for the official ones in any way.
Rating: 5 stars