Not as strong as it could be,
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This review is from: 17cm x 17cm Air Rifle Pellet Trap Takes all card targets at 17 x 17cm's (Misc.)
I have been using this for a while now (maybe 1000 pellets) and find that every hundred or so pellets I have to take it down and bend the edges that hold the targets back out to be able to put the targets in them - this happens because the back panel is not strong enough so it is becoming more and more concave over time where it is taking the impact of the pellets, causing it to pull the side holders inwards. It would be better if the target holder slots were not the same piece of metal that is stopping the pellets. Would buy a funnel pellet trap next time as I think this would do a better job.