Surfboards are a generally 4:1 in height to width ratio & 5:1 for Longboards. Please keep this in mind when you design your own artwork for your Surfboard. Also allow for the nose and Tail being narrower.

Please use these Submission Guidelines

JPEG: 300dpi at minimum 1/3 actual size of board.
AI: text outlined at minimum 1/3 actual size of board
EPS: 300dpi with text outlined at minimum 1/3 actual size of board
PSD: 300dpi with layers flattened at minimum 1/3 actual size of board
Happy Designing!

If you would like some templates in PDF for designing the board art try here..