I ordered these from a seller on Ebay - advertised as 8x6cm. At £3.17 all in for 10 I thought worth a try: The pictures tell the story. Short strings meant fiddly but not impossible to put on. I tried them on a 285 and a 288. I could have done better on the 288 but it works. They seem to end up slightly larger than the genuine Coleman #21. I have lit the 285 4 times with no apparent damage. Compared to the £8.00 per 4 that genuine spares seem to be sold for I am happy.