Density Set - Black Derlin, Set Of 12 Derlin Cylindrical Bars Of Different Length But The Same Diameter, Students Learn That The Density Of A Substance Is Constanteven As Its Mass And Volume Change. Comes In An Attractive Wooden Holder.
Gears, sets offer 40-, 30- and 20-tooth gears with 3/16in bore to accommodate the most popular dowel size, and a 12-tooth gear with a push-fit to 2 mm motor shafts. Three inserts are provided on each sprue, allowing the 3/16in bore to reduce to 3 mm
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