The Whetstone is a versatile training board designed to support climbers from their first finger training sessions through advanced protocols.

It incorporates a progression of contoured edge depths and grip types that offer lasting utility as skills advance.

The Whetstone's top jug features “Ergo Bumps,” sculpted to follow the natural curvature of the hand—ideal for warm-ups, movement prep, or *rehabilitative finger loading.

Key Features:

• Custom jug profile with ergo-bumps
• 40mm center edge w/10 degree incut
• 40mm 2-finger pockets
• 40mm edges
• 30mm edges
• 25mm edges
• 20mm edges

The Grindstone is a precision-engineered edge training platform designed to meet the demands of climbers across the performance spectrum.

It features a comprehensive progression of edge depths paired with Tension's signature edge radius profile that maximizes comfort while training.

Ideal for structured finger strength protocols, the Grindstone has become a foundational tool for serious climbers worldwide.

Key Features:

• Full Width "Bar-style" Top Jug
• 50mm center one-arm edge
• 30mm edges
• 25mm edges
• 20mm edges
• 15mm edges
• 10mm edges
• 8mm edges
• Top phone slot for timer

The Honestone is a purpose-built training board engineered for advanced to elite climbers.

It features a range of edge sizes and profiles, one-finger pockets, and a top macro-textured sloper, enabling targeted training across grip types.

Designed for specificity and intensity, the Honestone supports precision protocols that simulate the demands of high-end climbing.

Key Features:

• 35° and 45° top slopers with a continuously variable curvature and macro-texture
• 25mm center edge w/10 degree incut
• 25mm 1-finger pockets
• 20mm edges
• 15mm edges
• 10mm edges with a 1/8th inch edge radius
• 8mm edge with a 1/8th inch edge radius