I’ve just dug out my old Trickle nets (I must have bought them 10+ years ago or so). They are getting some serious abuse from the ponies who are picking them up and throwing them about like it’s some sort of game and they are still going strong. I tie the tops up like a shoelace and just chuck in the field (all unshod). Am now saving up to try and buy a couple more!
The ponies did need a bit of encouragement to use them to start with and I introduced alongside their normal ration but now they have got the hang of it they are a godsend, I can ration hay but still know they have something to pick at.