Bioflex Straight Industrial Shaft 20g 25mm (1 in.), 16g 37mm (1 1/2 in.), 14g 37mm (1 1/2 in.) and 10g 37mm (1 1/2 in.). Use sharp scissors or blade to shorten. Use with push on ball or push on disc or thread on your own steel balls. Push on ball and push on disc not avail for 20g & 10g.