---
product_id: 317174410
title: "Redrock 4 inch Rockwool Cubes – 4\" x 4\" Stone Wool Starter Blocks with 42/40 Hole | 6-Pack | for Hydroponics & Indoor Growing | Includes Twin Canaries Chart"
brand: "twin canaries liquid volume conversion chart"
price: "€ 42.53"
currency: EUR
in_stock: true
url: https://www.desertcart.it/products/317174410-redrock-4-inch-rockwool-cubes-4-x-4-stone-wool
store_origin: IT
region: Italy
---

# optimal moisture retention 4" x 4" precision cube 42/40 mm pre-formed hole Redrock 4 inch Rockwool Cubes – 4" x 4" Stone Wool Starter Blocks with 42/40 Hole | 6-Pack | for Hydroponics & Indoor Growing | Includes Twin Canaries Chart

**Brand:** twin canaries liquid volume conversion chart
**Price:** € 42.53
**Availability:** ✅ In Stock

## Summary

> 🌱 Elevate your indoor garden game with Redrock precision cubes!

## Quick Answers

- **What is this?** Redrock 4 inch Rockwool Cubes – 4" x 4" Stone Wool Starter Blocks with 42/40 Hole | 6-Pack | for Hydroponics & Indoor Growing | Includes Twin Canaries Chart by twin canaries liquid volume conversion chart
- **How much does it cost?** € 42.53 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/317174410-redrock-4-inch-rockwool-cubes-4-x-4-stone-wool)

## 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

- • **Sterile & Soil-Free:** Inert U.S.-sourced rock wool creates a contamination-free environment for vigorous root development.
- • **Effortless Transplanting:** Pre-formed 42/40 mm holes ensure seamless plug and cutting insertion every time.
- • **Balanced Moisture Control:** Retains water evenly while promoting ideal air exchange to prevent root stress.
- • **Precision Growth Platform:** 4" x 4" stone wool cubes engineered for flawless early-stage propagation.
- • **Universal Hydroponic Compatibility:** Perfectly suited for ebb & flow, drip irrigation, and all major hydroponic systems.

## Overview

Redrock 4 inch Rockwool Cubes are premium stone wool starter blocks designed for hydroponic and indoor growing. Featuring a 42/40 mm pre-formed hole, these sterile, moisture-retentive cubes provide an optimal environment for early-stage propagation of leafy greens, herbs, and fruiting crops. Compatible with all major hydroponic systems, they ensure consistent root health and easy transplanting, making them a must-have for professional and hobbyist growers alike.

## Description

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

## Features

- Rockwool Cube for Hydroponics & Propagation – This 4” x 4” stone wool cube is engineered for early-stage growth and propagation in hydroponic systems, perfect for leafy greens, herbs, and fruiting crops.
- Pre-Formed 42/40 Planting Hole – Each block includes a standard 42/40 mm hole designed for clean and easy transplanting of starter plugs or cuttings.
- Inert Stone Wool Composition – Manufactured from dense, U.S.-sourced rock wool for a sterile, soil-free environment that supports consistent moisture and air balance.
- Efficient Moisture Retention – These rock wool planting cubes retain water evenly while allowing proper dry-back and air exchange, helping maintain healthy root zone conditions.
- Compatible with All Major Systems – Ideal for use in ebb & flow, drip irrigation, and other hydroponic setups—trusted by greenhouse operators, indoor growers, and commercial cultivators.

## Product Details

- **Material:** Stone Wool
- **Special Feature:** organic
- **Planter Form:** Plant Pot
- **Shape:** Rectangular
- **Indoor/Outdoor Usage:** Indoor

## Images

![Redrock 4 inch Rockwool Cubes – 4" x 4" Stone Wool Starter Blocks with 42/40 Hole | 6-Pack | for Hydroponics & Indoor Growing | Includes Twin Canaries Chart - Image 1](https://m.media-amazon.com/images/I/71L0ldvRKSL.jpg)

## Frequently Bought Together

- Redrock Rockwool Cube – 4" x 4" PRO Stone Wool Starter Block with 42/40 Hole | Rockwool for Hydroponics and Indoor Growing | 6 Pack + Twin Canaries Chart
- Redrock Rockwool Cube – 6" x 6" PRO Stone Wool Planting Block with 42/40 Hole | Commercial Rockwool for Hydroponics | 4 Pack + Twin Canaries Chart
- VidaWool 1.5" Seed Starter Plugs-Hydroponic Pods- Stone Wool-Rock Wool Cubes for Hydroponics-Plant Starter Grow Pods-Hydroponics Growing System-Garden Supplies for Plant Propagation-50 Count Bag

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**Shop now:** [https://www.desertcart.it/products/317174410-redrock-4-inch-rockwool-cubes-4-x-4-stone-wool](https://www.desertcart.it/products/317174410-redrock-4-inch-rockwool-cubes-4-x-4-stone-wool)

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-03-14*