practitioner chair foxter ruckPractitioner's chair FOXTER Ruck Universal swivel stool with all the advantages of the proven Bioswing seat. The stable star base, smooth rolling wheels, and the innovative Bioswing system guarantee completely relaxing sitting. Height adjustment from 44 to 57 cm via a gas spring. The patented elastic oscillating elements, the main components of the system, respond subtly and harmoniously to every vital impulse, no matter how subtle, and thus make