Amazon.com: OC Ramps 6ft Grind Box - Durable Skate Boxes for Grinding - Wood Skateboarding Obstacle with Metal Rail - Great for Bikes, Scooters, Snowboarding and Inline Skates as Well : Sports & Outdoors
Puzzle Manny Pad – Slapramps
Slappy Box - Four One Four Skateparks
How to build a skateboarding GRIND BOX (Easy and strong!) - YouTube
South Bay Skate Co - Skateboard Grind box - 4' & 6' Box Lengths – South Bay Board Co.