Tools and Materials › Ultra Soft Refractory Board - 4" x 4" x .5" Image 1 of 1 Ultra Soft Refractory Board - 4" x 4" x .5" $6.00 Limit 4 per order Ultra soft refractory for soldering and holding components in place. Add To Cart Added! Limit 4 per order Ultra soft refractory for soldering and holding components in place.