Exact same diameter as the others even though it's another batch, except for the 5kg bumper that is slightly smaller (on purpose i suppose to avoid cracking) paint ok, no defects, not the most refined bumper but the price is very good,its a thick bumper, solid as a rock. I use 4 cm proper gym mats and bumpers behave very well, small rebound from deadlift height or power clean height also good, no fear at all of cracking. I weighd them separately and the 20kg pair has a difference in 800g, the 15kg difference in 400g aprox. The 10kg spot on 100g, the fives also spot on les than 100g difference, For my garage gym this is more than enough. Super happy and looking forward to purchase the 25kg pair to finish the stack.