Semtex

Layer 1: Oval, light red, 45 degrees (highlight on center knob)
Layer 2: Circle, red (center knob; slighly offset from layer 3)
Layer 3: Circle, black, slightly larger than layer 2, right in the middle of layer 8 (border of center knob)
Layer 4/5: Triangle, grey (shadow cast from center knob; depending upon sizing, you may need one, two, or three layers to complete the shadow)
Layer 6: Oval, silver, 45 degrees (highlight of main grenade)
Layer 7: Circle, light grey (slightly offset from layer 8/9)
Layer 8: Circle, black, outline (outline of main grenade)
Layer 9: Circle, grey (main grenade body, same color as shadow in layers 4/5)
Layer 10: Square, black, outline, 45 degrees (grenade fuse outline)
Layer 11: Square, silver, 45 degrees (grenade fuse)