---
product_id: 356049738
title: "Redrock Rockwool Cubes – 6\" x 6\" Stone Wool Starter Blocks with 42/40 Hole | 4-Pack | for Hydroponics & Indoor Growing | Includes Twin Canaries Chart"
brand: "twin canaries liquid volume conversion chart"
price: "17.76 OMR"
currency: OMR
in_stock: true
url: https://www.desertcart.com.om/products/356049738-redrock-rockwool-cubes-6-x-6-stone-wool-starter-blocks
store_origin: OM
region: Oman
---

# Optimal moisture retention with balanced drainage Precision 42/40 mm planting hole Dense stone wool for robust root support Redrock Rockwool Cubes – 6" x 6" Stone Wool Starter Blocks with 42/40 Hole | 4-Pack | for Hydroponics & Indoor Growing | Includes Twin Canaries Chart

**Brand:** twin canaries liquid volume conversion chart
**Price:** 17.76 OMR
**Availability:** ✅ In Stock

## Summary

> 🌱 Grow smarter, not harder — elevate your hydroponics game with Redrock Rockwool!

## Quick Answers

- **What is this?** Redrock Rockwool Cubes – 6" x 6" Stone Wool Starter Blocks with 42/40 Hole | 4-Pack | for Hydroponics & Indoor Growing | Includes Twin Canaries Chart by twin canaries liquid volume conversion chart
- **How much does it cost?** 17.76 OMR with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/356049738-redrock-rockwool-cubes-6-x-6-stone-wool-starter-blocks)

## Best For

- twin canaries liquid volume conversion chart enthusiasts

## Why This Product

- Trusted twin canaries liquid volume conversion chart brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Root Powerhouse:** 6" x 6" commercial-grade block supports vigorous vegetative growth
- • **Moisture Mastery:** High water retention paired with ideal dry-back for oxygen-rich roots
- • **Hydroponic Harmony:** Versatile compatibility with drip, ebb & flow, and all major hydro systems
- • **Pure & Clean Growth:** Sterile, U.S.-sourced mineral wool ensures contaminant-free cultivation
- • **Perfect Fit Precision:** 42/40 mm hole engineered for seamless starter plug integration

## Overview

Redrock Rockwool Cubes are premium 6" x 6" stone wool starter blocks featuring a precision 42/40 mm hole, designed to support larger root systems in hydroponic and indoor growing setups. Made from sterile, U.S.-sourced mineral wool, these cubes offer superior moisture retention and balanced drainage, ensuring optimal oxygenation and contaminant-free growth. Ideal for a wide range of crops and compatible with all major hydroponic systems.

## Description

Redrock Rockwool Cubes – 6" x 6" Stone Wool Starter Blocks with 42/40 Hole | 4-Pack | for Hydroponics & Indoor Growing | Includes Twin Canaries Chart

## Features

- Premium Rockwool Cube for Hydroponics – This 6” x 6” commercial-grade grow block is ideal for growers using rockwool for hydroponics, designed to support larger root systems during vegetative growth.
- Stone Wool Construction with 42/40 Planting Hole – Manufactured from dense stone wool (rock wool), this grow block includes a precision-cut 42/40 mm hole to fit most starter plugs for clean transplants.
- High Retention, Balanced Drainage – RedRock rock wool planting cubes offer excellent moisture-holding capacity while allowing effective dry-back for optimal oxygenation.
- Made from U.S.-Sourced Rock Wool – Produced from high-quality mineral wool, these sterile rockwool cubes provide a clean and inert growing environment, free from contaminants and ideal for controlled systems.
- Versatile for Hydroponic Crop Types – Commonly used in greenhouses and indoor grows for leafy greens, peppers, tomatoes, and herbs—compatible with drip irrigation, ebb & flow, and other hydroponic systems.

## Product Details

- **Indoor/Outdoor Usage:** Indoor
- **Brand:** Twin Canaries Liquid Volume Conversion Chart
- **Material Feature:** Natural
- **Color:** Redrock
- **Special Feature:** organic
- **Item Weight:** 0.92 Kilograms
- **Sunlight Exposure:** Full Sun
- **Unit Count:** 1 Count
- **Product Care Instructions:** Water
- **Soil Type:** Sandy Soil

## Images

![Redrock Rockwool Cubes – 6" x 6" Stone Wool Starter Blocks with 42/40 Hole | 4-Pack | for Hydroponics & Indoor Growing | Includes Twin Canaries Chart - Image 1](https://m.media-amazon.com/images/I/61i9UZNrCTL.jpg)

## Available Options

This product comes in different **Size** options.

## Frequently Bought Together

- 6 inch Redrock Rockwool PRO Grow Block for Hydroponics | 4 Pack + Twin Canaries Chart
- Grodan Rockwool Delta GRO Blocks | 4" Cube - Pack of 6 | + Twin Canaries Chart
- Grodan RW108004 Rockwool, 50-Pack Macro Plant Plugs, Green

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**Shop now:** [https://www.desertcart.com.om/products/356049738-redrock-rockwool-cubes-6-x-6-stone-wool-starter-blocks](https://www.desertcart.com.om/products/356049738-redrock-rockwool-cubes-6-x-6-stone-wool-starter-blocks)

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*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-02-16*