# Block Modification

The block modification event is a startup event.

`BlockEvents.modification` event is a startup script event that allows you to change properties of existing blocks. ```JavaScript BlockEvents.modification(e => { e.modify('minecraft:stone', block => { block.destroySpeed = 0.1 block.hasCollision = false }) }) ``` All available properties: - `String material` - `boolean hasCollision` - `float destroySpeed` - `float explosionResistance` - `boolean randomlyTicking` - `String soundType` - `float friction` - `float speedFactor` - `float jumpFactor` - `int lightEmission` - `boolean requiresTool`