It appears to be a
"It appears to be a substantial butyl tube. Waiting for the snow to melt to get the bike off the trainer and onto the road. I'll know more later . . ."

Overall rating: 5.0 / 5 from 3 reviews.
Review topics: [].
"It appears to be a substantial butyl tube. Waiting for the snow to melt to get the bike off the trainer and onto the road. I'll know more later . . ."
"Exelent"
"A combination that can’t go wrong when you use tires & tubes from Pirelli. The quality is definitely there. Hope these will last a while or at least 3000 miles."