I like to buy big ones.
3.5mm dia https://www.ebay.co.uk/itm/25-X-BLACK-TYRE-REPAIR-STRING-HEAVY-DUTY-THIN-INSERTS-PLUGS-8-3-5MM-/153931324498?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=710-127635-2958-0
Then you cut them in half?
Yes. Or even length ways too if needed.
@giofox started
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I like to buy big ones.
3.5mm dia https://www.ebay.co.uk/itm/25-X-BLACK-TYRE-REPAIR-STRING-HEAVY-DUTY-THIN-INSERTS-PLUGS-8-3-5MM-/153931324498?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=710-127635-2958-0