Pre-prepared means your bat is ready for use after being knocked in and had a light oiling on exposed willow.
The way of knowing if your bat is Pre-Prepared is to look if your bat has a little GN silver sticker with PP (Pre-Prepared) or RP (Ready Play) on the top back shoulder.
Bats benefit from as much knocking in you can give so we would always advise to knock-in the bat for a further 1 1/2 to 2 hours with a mallet or cricket ball in a sock.
If your bat does not have our silver sticker, then you will need to knock in yourselves - you will need to oil and knock in for 6-7 hours.
Please be aware that some of our specialist cricket retailers will actually Pre-Prepare the bats themselves and they should advise you of this when you purchase your bat. If they didn't you need to pre-prepare the bat yourself.
The link below will show you how to do this;