Velox Tyre levers are made from a super tough composite, packed in three's the levers clip together and take up minimal room, they have a distinctive flat, wide shape, bright yellow and surprisingly stiff. 
The shallow hook at the end of the lever easily forces its way under even the most stubborn of tyre beads, and the shaped underside helps to keep them from sliding on the rim wall.
Now with a flint extractor, deflate the inner tube with the flat end of
extractor and remove the flint from your tyre with the pointy end.
You've tried the rest now try the best!