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These are tubes of generous size, yet they are very light (mine were about 65g). They are about 2 cm short, so first-time fitting is difficult.
As a personal challenge I tried fitting one in a 25mm tyre, and it's worked fine. Generally with latex tubes I think it's a good idea to inflate them for the first time to 50 or 60 psi, fully deflate them and then reinflate to no more that 60 psi, then inflating to the full specified pressure just before first use on the road/track.