I have queen size accordion slats that are brand new, just out of the box. I got the wrong size.
Info from retailer: Remove your old slats, unfold SlatSure onto your frame's side ledges, and restore solid bed support slats instantly. No tools required. THICKER SLATS, TIGHTER SPACING These 0.6 inch thick bed frame wood slats are 20% thicker than standard 0.5 inch factory slats. Ultra-narrow under 2.5 inch spacing provides continuous mattress support from edge to edge, safely supporting memory foam, latex, and hybrid mattresses. Wooden bed slats built for long-term bed frame support. NO FABRIC COVERING FOR BETTER AIRFLOW Unlike fabric-wrapped slat systems that trap moisture, SlatSure's open wood design stays fresh and hygienic. Smooth veneer top prevents splinters. Silicone-coated fabric strip on bottom provides anti-slip grip, noise dampening, and protects your frame. Wood slats for bed that stay quiet and in place. SIZED FOR STANDARD BED FRAMES