Steel Extension Spring, 6 x 0.25" Category_Science Gifts 6oz each in a 4-pack

6oz each in a 4-pack for chemistry-themed home entertaining and science enthusiast gifting

Adjustable-vibrator induction coil producing a 30mm spark from a 6-12V DC input

displayed on a plastic-and-metal rack with a carrying handle for transport

Offering four-decade rotary selection from 0 to 11

Fitted with a grey hand knob for tightening and a small plastic pulley

Steel Extension Spring, 6 x 0.25" Category_Science Gifts 6oz each in a 4-packSix inch steel extension spring with looped ends at 0. 25 inch diameter, the mid length option for paired Hooke's Law comparisons against 4 inch and 9 inch siblings in the series.