This product has a 2:1 shrink ratio and is both UL & SGS certified for up to 600V @125 Degree Centigrade.
Product is also RoHS Compliant.

Contents are as follows:
15pcs D12.7x18cm
10pcs D19.1x18cm
5pcs D25.4x18cm

Size: 12.7/19.1/25.4
5 colors: red, yellow, blue, black, white
Usage: Evenly heat them with gun for several seconds, shorter also can use lighter instead.