Traditional foam rollers have one rounded edge and one flat edge creating 'tram lines' that have to be corrected with a further roller-ing.

This new innovation of having concave foam both end means you get a solid line each time you roll and also means you can get much sharper edges on both sides of the roller.

The concave roller gives you the full working length of the foam sleeve making them 20% more efficient than your standard 4" roller!

Our in house testing of these left us practically giddy