Tension - When cool, can be extended to 14 cm. Heated, contracts to 29 mm overall with 2 Amps. 750 µm wire, activates at 45-55° C. Four pieces per pack. Use several in series for greater distance, or in parallel for greater force. Sold in a 4-Pack

Niti Compression Springs (Item #3-657) SRP $39.95

Compression - When cool, can be pressed down to 16 mm. Heated with 3 Amps, it extends to 30 mm with over 4 Newtons of force! 8 mm coil, 950 µm wire, activates at 55-65° C. Sold in a 4-Pack

Nitinol Wire by the meter

Untrained, as-drawn Ni-Ti wire in various sizes, cross sections and temperatures. Form and anneal to your own shapes for springs, thermal actuators, ''memory wire'' magic tricks, etc. Use with Actuator Design Manual. Diameter given in micrometers (i.e. Nitinol 375 = 375 µm) Priced per meter.

NiTi Wire 500µm, activates at 55-75°C (3-401) $14.95

NiTi Wire 750µm, activates at 55-75°C (3-088) $22.95

NiTi Wire 1000µm, activates at 55-75°C (3-402) $27.95

NiTi Wire 1250µm, activates at 55-75°C (3-094) $29.95