This is the Hollis Wrist Slate with 3 Writing Surfaces for Underwater Communication.

Features:

• 3 Writing Surfaces for plenty of room
• Adjustable Velcro wrist band
• Curved to fit comfortably around wrist and reduce drag
• Bright bungee lanyard attachment
• Comes with spare pencil and extra o-rings for keeping slates closed

Never miss a word with Hollis' streamlined, convenient Wrist-top writing slate.