If you are thinking of buying new bat rubbers, you need to check the latest list of authorised racket coverings.
List A on 1st April, valid from 1st April to 30th September and List B on 1st October, valid from 1st October to 31st March.
Coverings that are due to be withdrawn from the LARC are allowed a further 3 months of use after the publication date, until 31st December and 30th June respectively.
The latest list can be found at the ITTF website or clicking on LARC.