The C&F Design SF-3510 [Large] Midge System Foam is a foam insert designed for organizing and protecting fly-fishing gear, particularly midge boxes or small fly compartments. Here are the key details:

Specifications:

C&F Design SF-3510 [Large] Midge System Foam 23.7×11.8×1.5cm

– Size: 23.7 × 11.8 × 1.5 cm (approx. 9.3 × 4.6 × 0.6 inches)
– Material: High-density foam (likely closed-cell for durability and water resistance)
– Color: Typically light gray or tan (varies by brand)
– Design: Slotted or gridded foam for holding small flies (midges, nymphs, dry flies)

Common Uses:
– Fits into fly-fishing system boxes (e.g., C&F Design, Tacky, or similar brands).
– Ideal for organizing tiny flies (size 16–28) in rows or compartments.
– Protects delicate hooks and prevents tangling.

Compatibility:
– Check if your fly box has removable inserts or matching dimensions.
– Works well with C&F Design’s waterproof fly boxes or other brands with similar slot sizes.

Would you like recommendations for compatible fly boxes or alternatives?