Pre Cut Sew on Iron on Interfacing Patterns. 

These are used by Professions and SOLD at £1 EACH 
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Used by professional tailors 

Please note: 
Picture is for illustration purpose only. You will get different patterns each time you make an order. They can't be guaranteed as same as pictured. 

Iron on (or fusible) interfacing, also referred to as stabiliser, is a must-have essential for all dress-makers and tailors. Almost a hidden feature, interfacing adds firmness, structure, support and shape to areas of a garment or item that would need a bit of stability. 
 Precut interfacing is simple and easy to use, all you need is your piece, an iron and a press cloth. The interfacing is always applied to the wrong side of your fabric, to ensure you have a neat front to your piece.