.9mm wall thickness Removable Presta valve core Q-Tubes Standard Line packaging features environmentally friendly soy ink printing on recycled cardboard Labeled Size: 650b x 35-43 Valve Core: Removable Shaft Type: Threaded Tube Compound: Butyl Weight: 83g. NOTE: Q-Tubes is re-branding as Teravail, while the quality product remains the same. Stock is mixed, and some tubes will be branded Q-Tubes and some will be branded Teravail