We support all standard IAB sizes, which includes:

Leaderboard (728x90)
Full Banner (468x60)
Button (125x125)
Skyscraper (120x600)
Wide Skyscraper (160x600)
Vertical Banner (120x240)
Medium Rectangle (300x250)
Square Box (250x250)
Large Rectangle (336x280)
Small Rectangle (180x150)
Mobile X-Large Banner (300x50)
Mobile Large Banner (216x36)
Mobile Medium Banner (168x28)
Mobile Small Banner (120x20)
Billboard Banner (970x250)
Half Page Banner (300x600)
Half Box (195x285)
News Banner (390x95)
Mobile Standard Banner (320x50)