Two Rotatech Chains spec: 3/8" Pitch Low Profile, 1.1mm (0.043") Gauge, 40 Drive Links, Semi-chisel to fit a 10" Bar Checkout "Rotatech Chains" on Youtube to See The Video of Them In Action Before ordering please double check the spec of your chain to make sure you get the right ones, to check the number of drive links remove your chain and count the number of the inside links (the ones that sit in the sprockets) We produce the toughest of chains for the toughest of jobs. We are a well established UK business based in Sheffield. With over 20 years in the UK tree industry, we know what you expect from your tools and what they need. Our wide range of chainsaw consumables is designed to maintain the performance of your chainsaw and give them a new lease of life, helping to reduce cost over time and increase efficiency. We provide everything you need to ensure your chainsaw is running as best as it can including chains, bars, oils, files and sprockets. Premium quality chain - stay sharp longer Change your Guide Bar on average every 3 Chains. Other Rotatech Products Available Including, Chain Oil, Guide Bars, Files and Sprockets. Used by Arborists, Forestry Workers, Farmers, Wood Processers, Harvesters and Home Owners. Compatible with Oregon 91P040E, 91PX040E, Q91VG040E