Skill players generally receive the bulk of the credit for a team's offensive success, but the key to a great offense starts up front with the offensive line.

On Sunday, Phil Steele tweeted out an alphabetical list of his Top 7 offensive lines in college football for the 2015 season, featuring three SEC teams, two Big Ten teams, one Big 12 team, and one Pac-12 team.

Here's a look at Steele's Top 7 offensive lines, also listed in alphabetical order, along with the amount of returning starters for each team. While offensive line play can be difficult to quantify, some pass blocking and run blocking statistics from last season are also included below.

Note: The sack rate formula is sacks divided by (sacks plus pass attempts).

Arkansas Razorbacks

Returning starters: 4

2014 stats (pass blocking): 14 sacks allowed (359 pass attempts), 3.75% sack rate

2014 stats (run blocking): 2,834 yards (5.09 per carry), 31 TD

Baylor Bears

Returning starters: 5

2014 stats (pass blocking): 24 sacks allowed (519 pass attempts), 4.42% sack rate

2014 stats (run blocking): 2,802 yards (4.53 per carry), 43 TD

Georgia Bulldogs

Returning starters: 3

2014 stats (pass blocking): 17 sacks allowed (322 pass attempts), 5.01% sack rate

2014 stats (run blocking): 3,352 yards (6.04 per carry), 38 TD

Michigan State Spartans

Returning starters: 3

2014 stats (pass blocking): 11 sacks allowed (400 pass attempts), 2.68% sack rate

2014 stats (run blocking): 3,057 yards (5.15 per carry), 44 TD

Ohio State Buckeyes

Returning starters: 4

2014 stats (pass blocking): 28 sacks allowed (409 pass attempts), 6.41% sack rate

2014 stats (run blocking): 3,956 yards (5.75 per carry), 41 TD

Ole Miss Rebels

Returning starters: 5

2014 stats (pass blocking): 31 sacks allowed (428 pass attempts), 6.75% sack rate

2014 stats (run blocking): 2,021 yards (4.25 per carry), 21 TD

USC Trojans

Returning starters: 5

2014 stats (pass blocking): 32 sacks allowed (460 pass attempts), 6.50% sack rate

2014 stats (run blocking): 2,092 yards (3.99 per carry), 18 TD

So which team has the top offensive line in the country heading into the 2015 season? Voice your opinion in the poll below.

There are some notable omissions from the Steele's Top 7, such as Alabama, Auburn and Wisconsin, three teams that have been consistently great up front for the past several years.