Hybrid Raceboards are defined as any ISAF Approved Production Raceboard that is 310 cm, or less, in length.
For the Raceboard Youth Championships only Hybrid boards will be permitted. The boards currently classified as hybrid include:
Bic Techno 293
Bic Sport Hybrid
Exocet Pacer and Pacer Pro
Neil Pryde RS:X
Neil Pryde RS:One
Starboard Phantom 295 AST
Surfers Group Hybrid Race One
For full details of these boards and to see the full production boards list: http://www.sailing.org/11675.php
Note - there are older models registered with ISAF that may also be raced in the R310 division.