This is 4mm OD Aluminium tube very nice tube BRAND NEW with a wall thickness of 0.45mm, The great thing about this tubing that the next size up (5mm) fits the 4mm inside it  and this is the same for all the tubing by K & S. All the tubing the size below fits inside each other.

This is for a 12" length posted same day as purchase next day delivery please check my feedback.

INTERNATIONAL BUYER PLEASE READ BELOW

Royal Mail Airmail (small packet) is NOT a tracked or insured service.
Royal Mail International signed-for is tracked and insured upto £50 these are royal mail prices not mine and is completely of of my control.