TRIMFINITY interior composite mouldings suit all your moulding needs, whether you are a do-it-yourselfer or a professional contractor. The 9/16-in X 5-1/4-in X 96-in colonial 5163 base interior polystyrene moulding cuts, installs and fills just like wood and MDF moldings. The Trimfinity advantage is it's more durable, resistant to moisture, mold, mildew and pests. Our mouldings are also better for the planet, made of at least 90% recycled polystyrene. Use as is with our pre-finished white surface or easily paint.
- 5163 Colonial Base Moulding 
- Enhance your next project with pre-finished composite  moulding 
- Easy cut and install 
- Durable and Waterproof Interior Moulding 
- Resistant to mold, mildew and pests 
- Polystyrene made from over 90% of recycled materials 
- 96-in length ideal for all job sites 
- For interior use 
- Prefinished White, Paintable