There are some 'bubbles' in the slab (Pictures 16-18), there is a forum about it online "Weird bubbles in PSA Slab", I recently had another card with this issue and tried their suggestion of 'PlastRX' and the 'bubbles' came off. You can only see them in certain light, more so on the back. These 'bubbles' were present when I bought the slab and didn't realise/wasn't told about this so I didn't want to do the same without addressing it.
If you would like any more pictures just let me know
Slab will be bubble wrapped and sent in a bubble envelope to ensure protection
Any questions please ask!