What Magnets for making wooden knife rack?

So I am going to make a magnetic knife rack. I want to counter sink the magnets into the back of the board so that there is a nice clean face for the knives to rest against. Wanted to know what magnets would be best for such an application. Any direction / advice on what to look for or where to get said magnets would be greatly appreciated.

Best,
Byron

neodymium magnet are available in different strengths. I've bought some from KJmagnetics

What strengths did you find to work best? Would like to narrow it down to one or two to try.

Try Lee Valley Tools (www.leevalley.com). They have all kinds of magnets.

Tim

This place as very good prices and I got mine there (Model# ND021-N48): http://www.magnet4less.com/index.php?cPath=11&osCsid=6df59a2e9836cc1d274c89c5f47034a9
This place has a nice tutorial on making a magnetic knife rack, but there magnet prices are much more expensive. https://www.kjmagnetics.com/blog.asp?p=magnetic-knife-holder

I do believe N52 neodymium magnets are the strongest grade currently available. Amazon has them. To build a magnetic knife rack, I'd use recessed ring magnets with a minimum of 6lbs pull each.

McMaster Carr has a wonderful, although very expensive, selection of ring magnets. I only post this link as it is a good place to look to get ideas of what magnetic material is commercially available and what pull force one should expect from a given volume of magnetic material.http://www.mcmaster.com/#ring-magnets/=uavb0x

I have used something about N48 (there is not all that much difference between the classes), 10mm in diameter and 5mm thick. I have placed them from behind some 2mm from the front surface - and the rack is strong enough. I have used 2 rows of magnets with 10mm separation between the neighbouring magnets. You will find more details here