Yes, these are true bottom stamps.  Blank tops.  Make a great blank canvas to dye on.  Bottom Stamped  with the Phenix Bar stamp.  See photo for stamp view.

The Valkyrie currently holds the World Record at 820'. In lighter weights gives new players extra distance. Lighter weights also give players extreme range when thrown downwind, while maximum weights can give excellent upwind distance. The Valkyrie’s high speed turn and flight characteristics make it great choice for long range turnover shots and rollers. The Star Valkyrie is endorsed by World Record distance holder Christian Sandstrom.

Champion Plastic:
High quality plastic which provides superior durability and reliable performance
Suitable for the increased throwing speeds of professional players
Retains flight characteristics longer than DX or Pro Plastics

Innova Flight Characteristics:
Speed:  9
Glide:  4
High Speed Turn:  -2
Low Speed Fade:  2