These study stainless shears are designed for either root pruning or for top pruning. But you shouldn't use them for both. Root pruning dulls and damages shears much faster than top pruning and you want to keep you top pruning shears as clean and sharp as possible. So it's important to have a different tool for each task.

Roshi stainless steel bonsai tools are known for precision cutting, durability, and excellent prices.
Made for Stone Lantern by Roshi Bonsai Tools. 7.5" (190 mm)