ITEM NAME:2Pcs Lightweight Bike Guide Chain Protector Mountain Bike Single Chainring .like-pro-float .like-pro-price-both{clear: both;.2 Piece Chain Guide. Specification: Æ35mm~31.8mm/ E type mount. It needs to be small and light, and it must be strong and durable, so we use a solid aluminum alloy as material with high hardness and long service life.