* Due to various circumstances, from 2021 the diving board is sold only through fisheries cooperative exclusive sales or direct sales. Please note that we do not offer sales to retail shops.

A State-of-the-Art Masterpiece

Every diving board KeyStone creates has become even more beautiful. Its material is rigid urethane foam. Rigid urethane foam is a material for which consistent, variation-free mass production is extremely difficult, yet KeyStone has applied the experience and proven results cultivated over many years to the molding of the diving board as well. The diving boards created by KeyStone's original mold technology stand out for the beauty of their surface gloss. And their appeal lies not only in their appearance. The overwhelming quality of the action (swimming motion) produced here is second to none.

Mold Machining Technology and Plastic Molding Technology

Mold machining technology and plastic molding technology that are entirely domestic (made in Japan). A veteran local fisherman says: "In a fisherman's whole life, how many diving boards with a truly satisfying action (swimming motion) can one ever come across?" With the diving boards KeyStone produces, 100 out of 100 achieve the best action (swimming motion). In reality, molding diving boards with no variation in their swimming motion has, until now, been extremely difficult. Over many years, KeyStone has built up the technical know-how for molding rigid urethane foam resin, and today the molding of diving boards that approach the ideal has become possible. The photo shows a diving board electrode being molded. Using cutting-edge IT technology, we make high-precision molding possible.

The Beauty of Surface Gloss

The surface finish of a diving board affects its action (swimming motion). The surface finish of the diving boards KeyStone makes has become even more dramatically beautiful.

Diving Board | KeyStone | Glass-Fiber Reinforcement

As needed, reinforcement is pre-inserted inside the diving board, and reinforced diving boards secure considerable toughness and strength. Whether or not reinforcement is present makes an order-of-magnitude difference in strength. Through precise mold design and machining technology, this reinforcement is fully integrated in a single molding, and it is an important factor in achieving a stable action (swimming motion) of the diving board. The glass-fiber-reinforced plastic is separately and uniquely molded to fit each of KeyStone's various diving boards, keeping the quality of the diving board's total balance at a high level.

Its Outstanding Swimming Action

Because special mold machining is applied, every diving board has a clearly defined outline. That clearly defined outline and the beauty of its shape remove the unstable elements in the diving board's swimming motion. Unlike diving boards made of paulownia wood, the body does not absorb water, so it achieves a stable action even during long periods of use. Its action is simply outstanding.

T-Type / Diving Board / KeyStone

The standard for targeting young bluefin tuna (yokowa)

Diving Board | KY-Type | KeyStone

K2-Type / Diving Board / KeyStone

KL-Type / Diving Board / KeyStone

KO-Type / Diving Board / KeyStone

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