The Front Cap from the Layer-X Filter Shell, sold on its own.

An aluminum magnetic cap. It attaches directly to the front of the BASE filter on your lens and works as a lens cap. No threads to turn: just put it on and take it off.

Pair it with a Rear Cap to carry your stacked filters between the two caps.

Includes: 1 Front Cap (Rear Cap sold separately)

For the pair, see Layer-X Filter Shell (Front / Rear Set).