A tube for accommodating a golf club is provided with internal structure to prevent rotation of the club and to centralize the club shaft. The shaft flange is in a convex trapezoid shape and is positioned vertically along the shank to make a pointed or planar cut so as to reduce friction for a smoother driving, an easier and labor-saving operation. The device exhibits a switching behavior at a certain voltage and can be used in arrays to form a memory device. Another chamber in the form of a cassette, for performing an electrophoresis in the second dimension following the isoelectric focusing, includes two plates and at least one seal which separates these plates and is distinguished by including such a strip holder, the strip holder being sealingly inserted into a recess in one of these plates. The porous structure enables bone growth, and the device has a high surface friction coefficient, and has a stable structure and mechanical properties are similar to bones.