SRBP TUBES ARE MAINLY IN TRANSFORMERS. IT IS MADE OF ELECTRICAL GRADE KRAFT PAPER WITH INSULATING VARNISH. THERE ARE DIFFERENT QUALITIES AVAILABLE FROM INDUSTRIAL TO COMMERCIAL WHICHEVER SUITS THE CUSTOMER. THE RATE WILL DEPEND ON THE QUALITY, CUSTOMER REQUIRES. IT IS AVALIABLE IN VARIOUS SIZES: 3/8" X 1/4" 3/8" X 1/2" 1/2" X 5/8" 5/16" X
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