Stainless steel as per DIN (AISI)
Body : 1.4305 (1.4571 with flange)-(316 Ti)-specia
Internal parts : 1.4305 (303)-standard, 1.4571 (316 Ti)
Wheel : 1.4122 (303)-standard, 1.4460 (329) special
Bearing : Tungsten carbide or teflon
Weight
Small sizes: 4 to 35 lbs (2 to 16 kg)
Large sizes: 25 to 340 lbs (11 to 155 kg)
Electronics: 0.5 to 5.5 lbs (0.25 to 2.5 kg)