diff --git a/public/starter-materials/long_thin_running_brick_250x250/roughness.tmp.png b/public/starter-materials/long_thin_running_brick_250x250/roughness.tmp.png
deleted file mode 100644
index 058012f1..00000000
Binary files a/public/starter-materials/long_thin_running_brick_250x250/roughness.tmp.png and /dev/null differ
diff --git a/public/starter-materials/long_thin_running_brick_250x250/roughness.webp b/public/starter-materials/long_thin_running_brick_250x250/roughness.webp
index e69de29b..75ee63c7 100644
Binary files a/public/starter-materials/long_thin_running_brick_250x250/roughness.webp and b/public/starter-materials/long_thin_running_brick_250x250/roughness.webp differ
diff --git a/public/starter-materials/matte_painted_metal_250x250/basecolor.webp b/public/starter-materials/matte_painted_metal_250x250/basecolor.webp
new file mode 100644
index 00000000..89831dd5
Binary files /dev/null and b/public/starter-materials/matte_painted_metal_250x250/basecolor.webp differ