New on the Czech market! SwitchGrip® Replaceable thumbs.22.02.2018Not only the new ball, but your old ball can also have a replaceable thumb!
Drilling out the old hole and sticking the insert for the exchangeable thumb is done for CZK 500 incl. VAT.
The exchangeable thumbs you can buy for CZK 500 incl. VAT.
More info at firstname.lastname@example.org