12 "13" sound controlled drum heads drum skin

body material: good quality PET plastic(Polyethylene terephthalate)

edge material: the outer layer is aluminum, the inside is iron

thickness: 0.188mm(black and white, same)

international size as below, but not right drum skin size

8inch= 20.32cm
10inch= 25.4cm
12inch= 30.48cm
13inch= 33.02cm
14inch= 35.56cm
16inch= 40.64cm
18inch= 45.72cm
20inch= 50.8cm
22inch= 55.88cm

whole drum skin size should be, add about 12mm(edge size)

an example: 14inch drum skin=36.8cm

whole drum skin size =14inch(35.6cm) +about 12mm longer (edge size)=about 36.8cm

If with question, please