Decode the label
Product Number and Size Guide
Products in the same material family share their first digits. The final size code tells you how fine or coarse the material is.
1052105 Pennsylvania Gray family 2 HO-size material
The simple rule
Read from left to right
- Find the material family.The opening digits identify the color or blend—for example, 105 is Pennsylvania Gray.
- Read the ending size code.The final digit, or 03 blend ending where applicable, identifies the material grade.
- Then choose the package.Bag and LBS change the amount you receive, not the rock size represented by the product number.
From powder to boulders
What each size code means
Use the code as a fast guide, then confirm the wording in the product title for the exact intended scale or use.
0
Powder or very fineWeathering, fine soil, paving color and the smoothest surface texture.
1
N-scale sizeFine ballast sized for N-scale track and small, controlled scenery details.
2
HO-scale sizeThe standard choice for most HO-scale track, yards and sidings.
03
Sand and gravel blendA mixed fine aggregate used for roads, washes, shoulders and natural ground.
3
Larger ballast / O-scale materialOften used for HO mainline texture, O-scale track and larger aggregate effects.
4
G-scale or larger materialCoarser material for garden railroads, G scale and larger scene details.
5
Small rocksLoose rock, talus, drainage and small rip-rap effects.
6
Medium rocksRock fills, embankments, loads and larger drainage work.
7
Large rocks and bouldersHeavy rip rap, major rock fills, cuts and prominent boulders.
One color, four rock sizes
Pennsylvania Gray: 1051 through 1054
All four products use Pennsylvania Gray stone. Only the ending size code changes, making the particles progressively larger.
