Pale Masonite Boards from Apollon GoTrick are 3 mm think.
Gotrick Inc – Hues Art Supply
Apollon Gotrick Standard Black Artist Canvas Open Stock
Apollon Gotrick Canvas & Floating Frame 3/4 Unfinished 11 x 14
Hardboard Tempered Panel (Common: 1/8 X Actual: X X, 50% OFF
Pale Masonite Panel - 3 mm
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Richeson Masonite Boards
Masonite Board unprimed – Foto Shop. Gallery
Hardboard Tempered Panel (Common: 1/8 X Actual: X X, 50% OFF
Apollon Gotrick 3/4 Standard Artist Canvas 8 x 16
Apollon Gotrick Gallery 1-1/2 Liquid Art Panel 10 x 10
Massonite Panels - Canvases & Panels - Surfaces & Easels
Apollon Gotrick- Birch wood panel 1 5/8 profile – Foto Shop. Gallery
Gotrick Dark Masonite Panels – Barratt's Office Pro