Simple stencil best used with a brush. Thick enough for easy handling. Triangular projections are to help with orientation.
Usage:
For best results, use the points to help orient the stencil, then secure with painters tape. Use a paint brush with a flat head lightly loaded with paint to stipple the paint onto the surface for a clean look. Over applying paint will tend to bleed under the edges and create a ragged appearance.
The author marked this model as their own original creation.