i dunno. but most are 30cm. id imagine these are the same. check out eblag, i got a pair of 4ft yellow uns 38mm thick for £40 ;)

bar-gain

G
 
you may think that 38mm aint enough and decide on the 50's. but these weigh loads and the 50's will be loads more... for the amount you will use em, i think 38's will be stong/heavy enough. i havent even used mine yet!
 

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