#1.9 EPP (Expanded Polyproplyene) Foam. This foam is a little more dense compared to the #1.3. This allows you to have less reinforcements from carbon fiber at the cost of extra weight.
This is a light weight and durable foam that can be used to create various parts for radio control planes and for other hobbies. The foam is cut with a knife which gives a slight deviation in thickness. This also means there is no skin left over from a hot wire cut.
Dimensions: 36″ x 24″ x 3mm
Thickness may vary +/- 0.5 mm