Thanks for the replies, I was thrown as I had expected them to be made from the same material as the hull or even plastic not plywood.

Like I say its my first build and the instructions are not all that clear. Would you replace them for a sturdier material? Now you've told me this I'm thinking of getting something more robust and laminating into the hull instead of just stuck and pinned. I'll let you know if it works or not.
I would have posted pictures but the wife tells me i need something like tiny pic to do so, as this is the first forum i've joined I have no clue what so ever what the hell she's on about
Thanks again Derek and Liverbudgie and Tigertiger