Responding to demand from boat builders and sailors alike, Seldén Mast has expanded its popular range of Roller Bearing Blocks (RBB).

The low resistance, high dynamic load block range will now include larger single and single/stand ups in 100mm and 130mm diameter blocks, ideal for backstays, mainsheet arrangements and sheets for downwind sails on yachts of various sizes.

"The boat builders we work with have been requesting larger blocks in our Roller Bearing Block range for spinnaker sheets, backstays and German sheeting, so we've extended the range to fulfil this need," says Steve Norbury, Managing Director at Seldén Mast's UK subsidiary.

"The new blocks' low resistance at high, dynamic loads will make it easier for sailors to release a highly tensioned backstay, main sheet, spinnaker halyard or kicker, and as the blocks respond instantly to maintain delicate trimming and sail handling, sailors can just focus on what really matters - performance and boat speed."

The RBB range features machined, black anodised aluminium cheeks and sheave, Torlon? roller bearings for radial loads and thrust bearings for resisting side loads.

Available this spring, with the two new blocks Seldén's RBB range is now available in sizes 60mm to 130 mm diameter.