Help on posting a cable/wire (royal mail)?

Hello I'm thinking about selling iPhone/iPad charging cables (just the syncing wire). I was just wondering that when i post these to the buyers, can I post them in a second class letter (50p). Or would i have to use second class big letter (69p), OR would i have to use small parcel (£2.50). I would like to minimise my cost but at the same time get the cables to the buyers within 7 days so they're happy. Thanks.

Added (1). the wires are one metre long

I would wind them up and put them in a padded envelope and send it as a small parcel. Or put them in a large envelope and send them as second class big letter.

Best to get a padded envelope and get it weighed at post office. Do not need to send registered delivery just get proof of posting free

If you send them via second class and they get lost your buyer will want a refund and he will leave you negative feedback.

Best to send it via Tracked delivery even though that is expensive. EBay have now changed their policies and they support the buyers (even if they lie) 100%. So you better cover yourself if you want to sell on ebay because otherwise you will end up with huge losses.

The issue is likely to be the thickness of the package - anything more than 5mm thick has to go as a large letter. It should go as a letter, but you might want to use one of the signed for services so that you have a check on whether it arrived or not.

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