Iron or bumper?

Iron Bumper
Diameter Only the 100 and 45 are 450 mm The 45, 25, and 10 are all 450 mm
best if you want to deadlift less than 135 pounds at the proper height
Dropping Needs a platform or rubber floor Snatch and clean-and-jerk friendly
Thickness Thinner
lets you fit more plates on the bar		 Thicker
Lip on the rim Deep
easy to grip securely		 Shallower