These rocks should work great for Z, N, or HO scale trains. I bought them for Z scale use but, there are a variety of sizes to choose from in one mold. Since getting this mold I have switched over to printing rocks with a 3D printer.

When I place it on a surface the mold does not lay flat due to the ridges on the back side being different heights. does that affect the castings?

Not sure I understand your questions, but I made a frame out of styrofoam and toothpicks to hold the mold level when I poured the plaster so it would dry level.

What is the size difference of scale HO and N?

An N scale foot would be about 1/16 of an inch long, an HO scale foot would be about 1/8 of an inch long. Example: a "forty foot" long boxcar model would be about 5-1/2 inches long in HO scale and about 2 3/4" long in N scale.

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Woodland Scenics WS 1230 Rock Mold-Outcroppings - 5 x 7

Product ID: 12515869

Details

Brand
Woodland
Color
Black
Item dimensions L x W x H
4 x 4 x 1
Material
Silicone
Shape
decorative

📏Varied rock sizes 1.25" to 3.38"

🪨Realistic rock textures

♻️Flexible & reusable silicone

17832CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🪨 Mold your masterpiece with nature’s finest details!

PERFECT SCALE VARIETY - Rocks range from 1.25" to 3.38" to fit any diorama or model terrain seamlessly.
EFFORTLESS REUSABILITY - Create multiple rock outcroppings without wear—ideal for ongoing creative projects.
FLEXIBLE SILICONE FORM - Durable, bendable mold lets you create countless unique rock formations with ease.
TRUE TO LIFE TERRAIN ACCENTS - Expertly crafted molds capture authentic rock details for ultra-realistic landscapes.
TRUSTED WOODLAND SCENICS QUALITY - Join 500+ enthusiasts who rate this mold 4.6 stars for premium hobby craftsmanship.

The Woodland Scenics WS 1230 Rock Mold-Outcroppings is a premium silicone mold designed to create realistic rock formations for scale models and dioramas. Featuring flexible, reusable material and a range of rock sizes from 1.25" to 3.38", it offers true-to-life textures and expert craftsmanship favored by hobbyists worldwide.

Specifications

ASIN	B0000WS7D0
Brand Name	Woodland Scenics
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (516)
Global Trade Identification Number	00724771012306
Item Dimensions	4 x 4 x 1 inches
Item Weight	4.54 g
Manufacturer	Woodland Scenics
Manufacturer Part Number	SG_B0000WS7D0_VR3
Material Type	Silicone
Model Number	SG_B0000WS7D0_VR3
Number of Items	1
Number of Packs	1
Number of Pieces	1
Shape	decorative
UPC	793631634750 724771012306
Unit Count	1 Count

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